ClickHouse/tests/clickhouse-test

#!/usr/bin/env python3

# pylint: disable=too-many-return-statements
# pylint: disable=global-variable-not-assigned
# pylint: disable=global-statement
# pylint: disable=too-many-lines
# pylint: disable=anomalous-backslash-in-string
# pylint: disable=protected-access

import copy
import enum
import glob

# Not requests, to avoid requiring extra dependency.
import http.client
import io
import itertools
import json
import math
import multiprocessing
import os
import os.path
import platform
import random
import re
import shutil
import signal
import socket
import string
import subprocess
import sys
import tempfile
import traceback
import urllib.parse

# for crc32
import zlib
from argparse import ArgumentParser
from ast import literal_eval as make_tuple
from contextlib import redirect_stdout
from datetime import datetime, timedelta
from errno import ESRCH
from subprocess import PIPE, Popen
from time import sleep, time
from typing import Dict, List, Optional, Set, Tuple, Union

try:
    import termcolor  # type: ignore
except ImportError:
    termcolor = None


USE_JINJA = True
try:
    import jinja2
except ImportError:
    USE_JINJA = False
    print("WARNING: jinja2 not installed! Template tests will be skipped.")

MESSAGES_TO_RETRY = [
    "ConnectionPoolWithFailover: Connection failed at try",
    "DB::Exception: New table appeared in database being dropped or detached. Try again",
    "is already started to be removing by another replica right now",
    # This is from LSan, and it indicates its own internal problem:
    "Unable to get registers from thread",
]

MAX_RETRIES = 3

TEST_FILE_EXTENSIONS = [".sql", ".sql.j2", ".sh", ".py", ".expect"]

VERSION_PATTERN = r"^((\d+\.)?(\d+\.)?(\d+\.)?\d+)$"

TEST_MAX_RUN_TIME_IN_SECONDS = 180


class SharedEngineReplacer:
    ENGINES_NON_REPLICATED_REGEXP = r"[ =]((Collapsing|VersionedCollapsing|Summing|Replacing|Aggregating|)MergeTree\(?\)?)"
    ENGINES_MAPPING_REPLICATED = [
        ("ReplicatedMergeTree", "SharedMergeTree"),
        ("ReplicatedCollapsingMergeTree", "SharedCollapsingMergeTree"),
        (
            "ReplicatedVersionedCollapsingMergeTree",
            "SharedVersionedCollapsingMergeTree",
        ),
        ("ReplicatedSummingMergeTree", "SharedSummingMergeTree"),
        ("ReplicatedReplacingMergeTree", "SharedReplacingMergeTree"),
        ("ReplicatedAggregatingMergeTree", "SharedAggregatingMergeTree"),
    ]
    NEW_SYNTAX_REPLICATED_MERGE_TREE_RE = (
        r"Replicated[a-zA-Z]*MergeTree\((\\?'.*\\?')?,?(\\?'.*\\?')?[a-zA-Z, _}{]*\)"
    )
    OLD_SYNTAX_OR_ARGUMENTS_RE = r"Tree\(.*[0-9]+.*\)"

    def _check_replicad_new_syntax(self, line):
        return re.search(self.NEW_SYNTAX_REPLICATED_MERGE_TREE_RE, line) is not None

    def _check_old_syntax_or_arguments(self, line):
        return re.search(self.OLD_SYNTAX_OR_ARGUMENTS_RE, line) is not None

    @staticmethod
    def _is_comment_line(line):
        return line.startswith("SELECT") or line.startswith("select")

    @staticmethod
    def _is_create_query(line):
        return (
            line.startswith("CREATE")
            or line.startswith("create")
            or line.startswith("ENGINE")
            or line.startswith("engine")
        )

    def _replace_non_replicated(self, line, escape_quotes, use_random_path):
        groups = re.search(self.ENGINES_NON_REPLICATED_REGEXP, line)
        if groups is not None and not self._check_old_syntax_or_arguments(line):
            non_replicated_engine = groups.groups()[0]
            basename_no_ext = os.path.splitext(os.path.basename(self.file_name))[0]
            if use_random_path:
                shared_path = "/" + os.path.join(
                    basename_no_ext.replace("_", "/"),
                    str(os.getpid()),
                    str(random.randint(1, 1000)),
                )
            else:
                shared_path = "/" + os.path.join(
                    basename_no_ext.replace("_", "/"), str(os.getpid())
                )

            if escape_quotes:
                shared_engine = (
                    "Shared"
                    + non_replicated_engine.replace("()", "")
                    + f"(\\'{shared_path}\\', \\'1\\')"
                )
            else:
                shared_engine = (
                    "Shared"
                    + non_replicated_engine.replace("()", "")
                    + f"('{shared_path}', '1')"
                )
            return line.replace(non_replicated_engine, shared_engine)

        return line

    def _need_to_replace_something(self):
        return (
            self.replace_replicated or self.replace_non_replicated
        ) and "shared_merge_tree" not in self.file_name

    def _has_show_create_table(self):
        with open(self.file_name, "r", encoding="utf-8") as f:
            return re.search("show create table", f.read(), re.IGNORECASE)

    def __init__(
        self, file_name, replace_replicated, replace_non_replicated, reference_file
    ):
        self.file_name = file_name
        self.temp_file_path = get_temp_file_path()
        self.replace_replicated = replace_replicated
        self.replace_non_replicated = replace_non_replicated

        use_random_path = not reference_file and not self._has_show_create_table()

        if not self._need_to_replace_something():
            return

        shutil.copyfile(self.file_name, self.temp_file_path)
        shutil.copymode(self.file_name, self.temp_file_path)

        with open(self.file_name, "w", newline="", encoding="utf-8") as modified:
            with open(self.temp_file_path, "r", newline="", encoding="utf-8") as source:
                for line in source:
                    if self._is_comment_line(line) or (
                        reference_file and not self._is_create_query(line)
                    ):
                        modified.write(line)
                        continue

                    if self.replace_replicated:
                        for (
                            engine_from,
                            engine_to,
                        ) in SharedEngineReplacer.ENGINES_MAPPING_REPLICATED:
                            if engine_from in line and (
                                self._check_replicad_new_syntax(line)
                                or engine_from + " " in line
                                or engine_from + ";" in line
                            ):
                                line = line.replace(engine_from, engine_to)
                                break

                    if self.replace_non_replicated:
                        line = self._replace_non_replicated(
                            line, reference_file, use_random_path
                        )

                    modified.write(line)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, exc_tb):
        if not self._need_to_replace_something():
            return
        shutil.move(self.temp_file_path, self.file_name)


def get_temp_file_path():
    return os.path.join(
        tempfile._get_default_tempdir(), next(tempfile._get_candidate_names())
    )


def stringhash(s: str) -> int:
    # default hash() function consistent
    # only during process invocation https://stackoverflow.com/a/42089311
    return zlib.crc32(s.encode("utf-8"))


def read_file_as_binary_string(file_path):
    with open(file_path, "rb") as file:
        binary_data = file.read()
    return binary_data


# First and last lines of the log
def trim_for_log(s):
    if not s:
        return s
    lines = s.splitlines()
    if len(lines) > 10000:
        separator = "-" * 40 + str(len(lines) - 10000) + " lines are hidden" + "-" * 40
        return "\n".join(lines[:5000] + [] + [separator] + [] + lines[-5000:])
    return "\n".join(lines)


def is_valid_utf_8(fname):
    try:
        with open(fname, "rb") as f:
            contents = f.read()
            contents.decode("utf-8")
            return True
    except UnicodeDecodeError:
        return False


class TestException(Exception):
    pass


class HTTPError(Exception):
    def __init__(self, message=None, code=None):
        self.message = message
        self.code = code
        super().__init__(message)

    def __str__(self):
        return f"Code: {self.code}. {self.message}"


# Helpers to execute queries via HTTP interface.
def clickhouse_execute_http(
    base_args,
    query,
    body=None,
    timeout=30,
    settings=None,
    default_format=None,
    max_http_retries=5,
    retry_error_codes=False,
):
    if base_args.secure:
        client = http.client.HTTPSConnection(
            host=base_args.tcp_host, port=base_args.http_port, timeout=timeout
        )
    else:
        client = http.client.HTTPConnection(
            host=base_args.tcp_host, port=base_args.http_port, timeout=timeout
        )

    timeout = int(timeout)
    params = {
        "query": query,
        # hung check in stress tests may remove the database,
        # hence we should use 'system'.
        "database": "system",
        "connect_timeout": timeout,
        "receive_timeout": timeout,
        "send_timeout": timeout,
        "http_connection_timeout": timeout,
        "http_receive_timeout": timeout,
        "http_send_timeout": timeout,
        "output_format_parallel_formatting": 0,
        "max_rows_to_read": 0,  # Some queries read from system.text_log which might get too big
    }
    if settings is not None:
        params.update(settings)
    if default_format is not None:
        params["default_format"] = default_format

    for i in range(max_http_retries):
        try:
            client.request(
                "POST",
                f"/?{base_args.client_options_query_str}{urllib.parse.urlencode(params)}",
                body=body,
            )
            res = client.getresponse()
            data = res.read()
            if res.status == 200 or (not retry_error_codes):
                break
        except Exception as ex:
            if i == max_http_retries - 1:
                raise ex
            client.close()
            sleep(i + 1)

    if res.status != 200:
        raise HTTPError(data.decode(), res.status)

    return data


def clickhouse_execute(
    base_args,
    query,
    body=None,
    timeout=30,
    settings=None,
    max_http_retries=5,
    retry_error_codes=False,
):
    return clickhouse_execute_http(
        base_args,
        query,
        body,
        timeout,
        settings,
        max_http_retries=max_http_retries,
        retry_error_codes=retry_error_codes,
    ).strip()


def clickhouse_execute_json(
    base_args, query, timeout=60, settings=None, max_http_retries=5
):
    data = clickhouse_execute_http(
        base_args,
        query,
        None,
        timeout,
        settings,
        "JSONEachRow",
        max_http_retries=max_http_retries,
    )
    if not data:
        return None
    rows = []
    for row in data.strip().splitlines():
        rows.append(json.loads(row))
    return rows


# Should we capture client's stacktraces via SIGTSTP
CAPTURE_CLIENT_STACKTRACE = False


def kill_process_group(pgid):
    print(f"Killing process group {pgid}")
    print(f"Processes in process group {pgid}:")
    print(
        subprocess.check_output(
            f"pgrep --pgroup {pgid} -a", shell=True, stderr=subprocess.STDOUT
        ).decode("utf-8"),
        end="",
    )
    try:
        if CAPTURE_CLIENT_STACKTRACE:
            # Let's try to dump stacktrace in client (useful to catch issues there)
            os.killpg(pgid, signal.SIGTSTP)
            # Wait some time for clickhouse utilities to gather stacktrace
            if RELEASE_NON_SANITIZED:
                sleep(0.5)
            else:
                sleep(10)
        # NOTE: this still may leave some processes, that had been
        # created by timeout(1), since it also creates new process
        # group. But this should not be a problem with default
        # options, since the default time for each test is 10min,
        # and this is way more bigger then the timeout for each
        # timeout(1) invocation.
        #
        # But as a workaround we are sending SIGTERM first, and
        # only after SIGKILL, that way timeout(1) will have an
        # ability to terminate childrens (though not always since
        # signals are asynchronous).
        os.killpg(pgid, signal.SIGTERM)
        # We need minimal delay to let processes handle SIGTERM - 0.1 (this may
        # not be enough, but at least something)
        sleep(0.1)
        os.killpg(pgid, signal.SIGKILL)
    except OSError as e:
        if e.errno == ESRCH:
            print(f"Got ESRCH while killing {pgid}. Ignoring.")
        else:
            raise
    print(f"Process group {pgid} should be killed")


def cleanup_child_processes(pid):
    print(f"Child processes of {pid}:")
    try:
        pgid = os.getpgid(os.getpid())
    except OSError as e:
        if e.errno == ESRCH:
            print(f"Process {pid} does not exist. Ignoring.")
            return
        raise
    print(
        subprocess.check_output(
            f"pgrep --parent {pid} -a", shell=True, stderr=subprocess.STDOUT
        ).decode("utf-8"),
        end="",
    )
    # Due to start_new_session=True, it is not enough to kill by PGID, we need
    # to look at children processes as well.
    # But we are hoping that nobody creates session in the tests (though it is
    # possible via timeout(), but we are assuming that they will be killed by
    # timeout).
    processes = subprocess.check_output(
        f"pgrep --parent {pid}", shell=True, stderr=subprocess.STDOUT
    )
    processes = processes.decode("utf-8")
    processes = processes.strip()
    processes = processes.split("\n")
    processes = map(lambda x: int(x.strip()), processes)
    processes = list(processes)
    for child in processes:
        child_pgid = os.getpgid(child)
        if child_pgid != pgid:
            kill_process_group(child_pgid)

    # SIGKILL should not be sent, since this will kill the script itself
    os.killpg(pgid, signal.SIGTERM)


# send signal to all processes in group to avoid hung check triggering
# (to avoid terminating clickhouse-test itself, the signal should be ignored)
def stop_tests():
    signal.signal(signal.SIGTERM, signal.SIG_IGN)
    cleanup_child_processes(os.getpid())
    signal.signal(signal.SIGTERM, signal_handler)


def get_db_engine(args, database_name):
    if args.replicated_database:
        return f" ON CLUSTER test_cluster_database_replicated \
            ENGINE=Replicated('/test/clickhouse/db/{database_name}', \
            '{{shard}}', '{{replica}}')"
    if args.db_engine:
        return " ENGINE=" + args.db_engine
    return ""  # Will use default engine


def get_create_database_settings(args, testcase_args):
    create_database_settings = {}
    if testcase_args:
        create_database_settings["log_comment"] = testcase_args.testcase_basename
    if args.db_engine == "Ordinary":
        create_database_settings["allow_deprecated_database_ordinary"] = 1
    return create_database_settings


def get_zookeeper_session_uptime(args):
    try:
        if args.replicated_database:
            return int(
                clickhouse_execute(
                    args,
                    """
            SELECT min(materialize(zookeeperSessionUptime()))
            FROM clusterAllReplicas('test_cluster_database_replicated', system.one)
            """,
                )
            )
        return int(clickhouse_execute(args, "SELECT zookeeperSessionUptime()"))
    except Exception:
        return None


def need_retry(args, stdout, stderr, total_time):
    if args.check_zookeeper_session:
        # Sometimes we may get unexpected exception like "Replica is readonly" or "Shutdown is called for table"
        # instead of "Session expired" or "Connection loss"
        # Retry if session was expired during test execution.
        # If ZooKeeper is configured, then it's more reliable than checking stderr,
        # but the following condition is always true if ZooKeeper is not configured.
        session_uptime = get_zookeeper_session_uptime(args)
        if session_uptime is not None and session_uptime < math.ceil(total_time):
            return True
    return any(msg in stdout for msg in MESSAGES_TO_RETRY) or any(
        msg in stderr for msg in MESSAGES_TO_RETRY
    )


def get_processlist_size(args):
    if args.replicated_database:
        return int(
            clickhouse_execute(
                args,
                """
                SELECT
                    count()
                FROM clusterAllReplicas('test_cluster_database_replicated', system.processes)
                WHERE query NOT LIKE '%system.processes%'
                """,
            ).strip()
        )
    return int(
        clickhouse_execute(
            args,
            """
                SELECT
                    count()
                FROM system.processes
                WHERE query NOT LIKE '%system.processes%'
                """,
        ).strip()
    )


def get_processlist_with_stacktraces(args):
    if args.replicated_database:
        return clickhouse_execute(
            args,
            """
        SELECT materialize(hostName() || '::' || tcpPort()::String) as host_port, *
        -- NOTE: view() here to do JOIN on shards, instead of initiator
        FROM clusterAllReplicas('test_cluster_database_replicated', view(
            SELECT
                p.*,
                arrayStringConcat(groupArray('Thread ID ' || toString(s.thread_id) || '\n' || arrayStringConcat(arrayMap(
                    x -> concat(addressToLine(x), '::', demangle(addressToSymbol(x))),
                    s.trace), '\n') AS stacktrace
                )) AS stacktraces
            FROM system.processes p
            JOIN system.stack_trace s USING (query_id)
            WHERE query NOT LIKE '%system.processes%'
            GROUP BY p.*
        ))
        ORDER BY elapsed DESC FORMAT Vertical
        """,
            settings={
                "allow_introspection_functions": 1,
            },
            timeout=120,
        )
    return clickhouse_execute(
        args,
        """
        SELECT
            p.*,
            arrayStringConcat(groupArray('Thread ID ' || toString(s.thread_id) || '\n' || arrayStringConcat(arrayMap(
                x -> concat(addressToLine(x), '::', demangle(addressToSymbol(x))),
                s.trace), '\n') AS stacktrace
            )) AS stacktraces
        FROM system.processes p
        JOIN system.stack_trace s USING (query_id)
        WHERE query NOT LIKE '%system.processes%'
        GROUP BY p.*
        ORDER BY elapsed DESC FORMAT Vertical
        """,
        settings={
            "allow_introspection_functions": 1,
        },
        timeout=120,
    )


def get_transactions_list(args):
    try:
        if args.replicated_database:
            return clickhouse_execute_json(
                args,
                "SELECT materialize((hostName(), tcpPort())) as host, * FROM "
                "clusterAllReplicas('test_cluster_database_replicated', system.transactions)",
            )
        return clickhouse_execute_json(args, "select * from system.transactions")
    except Exception as e:
        return f"Cannot get list of transactions: {e}"


def kill_gdb_if_any():
    # Check if we have running gdb.
    code = subprocess.call("pidof gdb", shell=True)
    if code != 0:
        return

    for i in range(5):
        code = subprocess.call("kill -TERM $(pidof gdb)", shell=True, timeout=30)
        if code != 0:
            sleep(i)
        else:
            break


# collect server stacktraces using gdb
def get_stacktraces_from_gdb(server_pid):
    try:
        # We could attach gdb to clickhouse-server before running some tests
        # to print stacktraces of all crashes even if clickhouse cannot print it for some reason.
        # We should kill existing gdb if any before starting new one.
        kill_gdb_if_any()

        cmd = f"gdb -batch -ex 'thread apply all backtrace' -p {server_pid}"
        return subprocess.check_output(cmd, shell=True).decode("utf-8")
    except Exception as e:
        print(f"Error occurred while receiving stack traces from gdb: {e}")
        return None


# collect server stacktraces from system.stack_trace table
def get_stacktraces_from_clickhouse(args):
    settings_str = " ".join(
        [
            get_additional_client_options(args),
            "--allow_introspection_functions=1",
            "--skip_unavailable_shards=1",
        ]
    )
    replicated_msg = (
        f"{args.client} {settings_str} --query "
        '"SELECT materialize((hostName(), tcpPort())) as host, thread_name, thread_id, query_id, trace, '
        "arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), "
        "arrayMap(x -> addressToLine(x), trace), "
        "arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace_str "
        "FROM clusterAllReplicas('test_cluster_database_replicated', 'system.stack_trace') "
        'ORDER BY host, thread_id FORMAT Vertical"'
    )

    msg = (
        f"{args.client} {settings_str} --query "
        "\"SELECT thread_name, thread_id, query_id, trace, arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), "
        "arrayMap(x -> addressToLine(x), trace), "
        "arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace_str "
        'FROM system.stack_trace FORMAT Vertical"'
    )

    try:
        return subprocess.check_output(
            replicated_msg if args.replicated_database else msg,
            shell=True,
            stderr=subprocess.STDOUT,
        ).decode("utf-8")
    except Exception as e:
        print(f"Error occurred while receiving stack traces from client: {e}")
        return None


def print_stacktraces() -> None:
    server_pid = get_server_pid()

    bt = None

    if server_pid and not args.replicated_database:
        print("")
        print(
            f"Located ClickHouse server process {server_pid} listening at TCP port {args.tcp_port}"
        )
        print("Collecting stacktraces from all running threads with gdb:")

        bt = get_stacktraces_from_gdb(server_pid)

        if len(bt) < 1000:
            print("Got suspiciously small stacktraces: ", bt)
            bt = None

    if bt is None:
        print("\nCollecting stacktraces from system.stacktraces table:")

        bt = get_stacktraces_from_clickhouse(args)

    if bt is not None:
        print(bt)
        return

    print(
        colored(
            f"\nUnable to locate ClickHouse server process listening at TCP port "
            f"{args.tcp_port}. It must have crashed or exited prematurely!",
            args,
            "red",
            attrs=["bold"],
        )
    )


def get_server_pid():
    # lsof does not work in stress tests for some reason
    cmd_lsof = f"lsof -i tcp:{args.tcp_port} -s tcp:LISTEN -Fp | sed 's/^p//p;d'"
    cmd_pidof = "pidof -s clickhouse-server"

    commands = [cmd_lsof, cmd_pidof]
    output = None

    for cmd in commands:
        try:
            output = subprocess.check_output(
                cmd, shell=True, stderr=subprocess.STDOUT, universal_newlines=True
            )
            if output:
                return int(output)
        except Exception as e:
            print(f"Cannot get server pid with {cmd}, got {output}: {e}")

    return None  # most likely server is dead


def colored(text, args, color=None, on_color=None, attrs=None):
    if termcolor and (sys.stdout.isatty() or args.force_color):
        return termcolor.colored(text, color, on_color, attrs)
    return text


class TestStatus(enum.Enum):
    FAIL = "FAIL"
    UNKNOWN = "UNKNOWN"
    OK = "OK"
    SKIPPED = "SKIPPED"


class FailureReason(enum.Enum):
    # FAIL reasons
    TIMEOUT = "Timeout!"
    SERVER_DIED = "server died"
    EXIT_CODE = "return code: "
    STDERR = "having stderror: "
    EXCEPTION = "having exception in stdout: "
    RESULT_DIFF = "result differs with reference: "
    TOO_LONG = (
        f"Test runs too long (> {TEST_MAX_RUN_TIME_IN_SECONDS}s). Make it faster."
    )
    INTERNAL_QUERY_FAIL = "Internal query (CREATE/DROP DATABASE) failed:"

    # SKIPPED reasons
    NOT_SUPPORTED_IN_CLOUD = "not supported in cloud environment"
    NOT_SUPPORTED_IN_PRIVATE = "not supported in private build"
    DISABLED = "disabled"
    SKIP = "skip"
    NO_JINJA = "no jinja"
    NO_ZOOKEEPER = "no zookeeper"
    NO_SHARD = "no shard"
    FAST_ONLY = "running fast tests only"
    NO_LONG = "not running long tests"
    REPLICATED_DB = "replicated-database"
    NON_ATOMIC_DB = "database engine not Atomic"
    OBJECT_STORAGE = "object-storage"
    S3_STORAGE = "s3-storage"
    AZURE_BLOB_STORAGE = "azure-blob-storage"
    BUILD = "not running for current build"
    NO_PARALLEL_REPLICAS = "smth in not supported with parallel replicas"
    SHARED_MERGE_TREE = "no-shared-merge-tree"
    DISTRIBUTED_CACHE = "distributed-cache"

    # UNKNOWN reasons
    NO_REFERENCE = "no reference file"
    INTERNAL_ERROR = "Test internal error: "


def threshold_generator(always_on_prob, always_off_prob, min_val, max_val):
    def gen():
        tmp = random.random()
        if tmp <= always_on_prob:
            return min_val
        if tmp <= always_on_prob + always_off_prob:
            return max_val

        if isinstance(min_val, int) and isinstance(max_val, int):
            return random.randint(min_val, max_val)
        return random.uniform(min_val, max_val)

    return gen


# To keep dependency list as short as possible, tzdata is not used here (to
# avoid try/except block for import)
def get_localzone():
    return os.getenv("TZ", "/".join(os.readlink("/etc/localtime").split("/")[-2:]))


class SettingsRandomizer:
    settings = {
        "max_insert_threads": lambda: (
            12 if random.random() < 0.03 else random.randint(1, 3)
        ),
        "group_by_two_level_threshold": threshold_generator(0.2, 0.2, 1, 1000000),
        "group_by_two_level_threshold_bytes": threshold_generator(
            0.2, 0.2, 1, 50000000
        ),
        "distributed_aggregation_memory_efficient": lambda: random.randint(0, 1),
        "fsync_metadata": lambda: random.randint(0, 1),
        "output_format_parallel_formatting": lambda: random.randint(0, 1),
        "input_format_parallel_parsing": lambda: random.randint(0, 1),
        "min_chunk_bytes_for_parallel_parsing": lambda: max(
            1024, int(random.gauss(10 * 1024 * 1024, 5 * 1000 * 1000))
        ),
        "max_read_buffer_size": lambda: random.randint(500000, 1048576),
        "prefer_localhost_replica": lambda: random.randint(0, 1),
        "max_block_size": lambda: random.randint(8000, 100000),
        "max_joined_block_size_rows": lambda: random.randint(8000, 100000),
        "max_threads": lambda: 32 if random.random() < 0.03 else random.randint(1, 3),
        "optimize_append_index": lambda: random.randint(0, 1),
        "optimize_if_chain_to_multiif": lambda: random.randint(0, 1),
        "optimize_if_transform_strings_to_enum": lambda: random.randint(0, 1),
        "optimize_read_in_order": lambda: random.randint(0, 1),
        "optimize_or_like_chain": lambda: random.randint(0, 1),
        "optimize_substitute_columns": lambda: random.randint(0, 1),
        "enable_multiple_prewhere_read_steps": lambda: random.randint(0, 1),
        "read_in_order_two_level_merge_threshold": lambda: random.randint(0, 100),
        "optimize_aggregation_in_order": lambda: random.randint(0, 1),
        "aggregation_in_order_max_block_bytes": lambda: random.randint(0, 50000000),
        "use_uncompressed_cache": lambda: random.randint(0, 1),
        "min_bytes_to_use_direct_io": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "min_bytes_to_use_mmap_io": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "local_filesystem_read_method": lambda: random.choice(
            # Allow to use uring only when running on Linux
            ["read", "pread", "mmap", "pread_threadpool", "io_uring"]
            if platform.system().lower() == "linux"
            else ["read", "pread", "mmap", "pread_threadpool"]
        ),
        "remote_filesystem_read_method": lambda: random.choice(["read", "threadpool"]),
        "local_filesystem_read_prefetch": lambda: random.randint(0, 1),
        "filesystem_cache_segments_batch_size": lambda: random.choice(
            [0, 1, 2, 3, 5, 10, 50, 100]
        ),
        "read_from_filesystem_cache_if_exists_otherwise_bypass_cache": lambda: random.randint(
            0, 1
        ),
        "throw_on_error_from_cache_on_write_operations": lambda: random.randint(0, 1),
        "remote_filesystem_read_prefetch": lambda: random.randint(0, 1),
        "allow_prefetched_read_pool_for_remote_filesystem": lambda: random.randint(
            0, 1
        ),
        "filesystem_prefetch_max_memory_usage": lambda: random.choice(
            ["32Mi", "64Mi", "128Mi"]
        ),
        "filesystem_prefetches_limit": lambda: random.choice(
            [0, 10]
        ),  # 0 means unlimited (but anyway limited by prefetch_max_memory_usage)
        "filesystem_prefetch_min_bytes_for_single_read_task": lambda: random.choice(
            ["1Mi", "8Mi", "16Mi"]
        ),
        "filesystem_prefetch_step_marks": lambda: random.choice(
            [0, 50]
        ),  # 0 means 'auto'
        "filesystem_prefetch_step_bytes": lambda: random.choice(
            [0, "100Mi"]
        ),  # 0 means 'auto'
        # "compile_expressions": lambda: random.randint(0, 1), - this setting has a bug: https://github.com/ClickHouse/ClickHouse/issues/51264
        "compile_aggregate_expressions": lambda: random.randint(0, 1),
        "compile_sort_description": lambda: random.randint(0, 1),
        "merge_tree_coarse_index_granularity": lambda: random.randint(2, 32),
        "optimize_distinct_in_order": lambda: random.randint(0, 1),
        "max_bytes_before_external_sort": threshold_generator(
            0.3, 0.5, 0, 10 * 1024 * 1024 * 1024
        ),
        "max_bytes_before_external_group_by": threshold_generator(
            0.3, 0.5, 0, 10 * 1024 * 1024 * 1024
        ),
        "max_bytes_before_remerge_sort": lambda: random.randint(1, 3000000000),
        "min_compress_block_size": lambda: random.randint(1, 1048576 * 3),
        "max_compress_block_size": lambda: random.randint(1, 1048576 * 3),
        "merge_tree_compact_parts_min_granules_to_multibuffer_read": lambda: random.randint(
            1, 128
        ),
        "optimize_sorting_by_input_stream_properties": lambda: random.randint(0, 1),
        "http_response_buffer_size": lambda: random.randint(0, 10 * 1048576),
        "http_wait_end_of_query": lambda: random.random() > 0.5,
        "enable_memory_bound_merging_of_aggregation_results": lambda: random.randint(
            0, 1
        ),
        "min_count_to_compile_expression": lambda: random.choice([0, 3]),
        "min_count_to_compile_aggregate_expression": lambda: random.choice([0, 3]),
        "min_count_to_compile_sort_description": lambda: random.choice([0, 3]),
        "session_timezone": lambda: random.choice(
            [
                # special non-deterministic around 1970 timezone, see [1].
                #
                #   [1]: https://github.com/ClickHouse/ClickHouse/issues/42653
                "America/Mazatlan",
                "America/Hermosillo",
                "Mexico/BajaSur",
                # These timezones had DST transitions on some unusual dates (e.g. 2000-01-15 12:00:00).
                "Africa/Khartoum",
                "Africa/Juba",
                # server default that is randomized across all timezones
                # NOTE: due to lots of trickery we cannot use empty timezone here, but this should be the same.
                get_localzone(),
            ]
        ),
        # This setting affect part names and their content which can be read from tables in tests.
        # We have a lot of tests which relies on part names, so it's very unsafe to enable randomization
        # of this setting
        # "prefer_warmed_unmerged_parts_seconds": lambda: random.randint(0, 10),
        "use_page_cache_for_disks_without_file_cache": lambda: random.random() < 0.7,
        "page_cache_inject_eviction": lambda: random.random() < 0.5,
        "merge_tree_read_split_ranges_into_intersecting_and_non_intersecting_injection_probability": lambda: round(
            random.random(), 2
        ),
        "prefer_external_sort_block_bytes": lambda: random.choice([0, 1, 100000000]),
        "cross_join_min_rows_to_compress": lambda: random.choice([0, 1, 100000000]),
        "cross_join_min_bytes_to_compress": lambda: random.choice([0, 1, 100000000]),
        "min_external_table_block_size_bytes": lambda: random.choice([0, 1, 100000000]),
        "max_parsing_threads": lambda: random.choice([0, 1, 10]),
        "optimize_functions_to_subcolumns": lambda: random.randint(0, 1),
        "parallel_replicas_local_plan": lambda: random.randint(0, 1),
        "output_format_native_write_json_as_string": lambda: random.randint(0, 1),
    }

    @staticmethod
    def get_random_settings(args):
        random_settings = {}
        is_debug = BuildFlags.DEBUG in args.build_flags
        for setting, generator in SettingsRandomizer.settings.items():
            if (
                is_debug
                and setting == "allow_prefetched_read_pool_for_remote_filesystem"
            ):
                random_settings[setting] = 0
            else:
                random_settings[setting] = generator()
        return random_settings


class MergeTreeSettingsRandomizer:
    settings = {
        "ratio_of_defaults_for_sparse_serialization": threshold_generator(
            0.3, 0.5, 0.0, 1.0
        ),
        "prefer_fetch_merged_part_size_threshold": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "vertical_merge_algorithm_min_rows_to_activate": threshold_generator(
            0.4, 0.4, 1, 1000000
        ),
        "vertical_merge_algorithm_min_columns_to_activate": threshold_generator(
            0.4, 0.4, 1, 100
        ),
        "allow_vertical_merges_from_compact_to_wide_parts": lambda: random.randint(
            0, 1
        ),
        "min_merge_bytes_to_use_direct_io": threshold_generator(
            0.25, 0.25, 1, 10 * 1024 * 1024 * 1024
        ),
        "index_granularity_bytes": lambda: random.randint(1024, 30 * 1024 * 1024),
        "merge_max_block_size": lambda: random.randint(1, 8192 * 3),
        "index_granularity": lambda: random.randint(1, 65536),
        "min_bytes_for_wide_part": threshold_generator(0.3, 0.3, 0, 1024 * 1024 * 1024),
        "compress_marks": lambda: random.randint(0, 1),
        "compress_primary_key": lambda: random.randint(0, 1),
        "marks_compress_block_size": lambda: random.randint(8000, 100000),
        "primary_key_compress_block_size": lambda: random.randint(8000, 100000),
        "replace_long_file_name_to_hash": lambda: random.randint(0, 1),
        "max_file_name_length": threshold_generator(0.3, 0.3, 0, 128),
        "min_bytes_for_full_part_storage": threshold_generator(
            0.3, 0.3, 0, 512 * 1024 * 1024
        ),
        "compact_parts_max_bytes_to_buffer": lambda: random.randint(
            1024, 512 * 1024 * 1024
        ),
        "compact_parts_max_granules_to_buffer": threshold_generator(0.15, 0.15, 1, 256),
        "compact_parts_merge_max_bytes_to_prefetch_part": lambda: random.randint(
            1, 32 * 1024 * 1024
        ),
        "cache_populated_by_fetch": lambda: random.randint(0, 1),
        "concurrent_part_removal_threshold": threshold_generator(0.2, 0.3, 0, 100),
        "old_parts_lifetime": threshold_generator(0.2, 0.3, 10, 8 * 60),
    }

    @staticmethod
    def get_random_settings(args):
        random_settings = {}
        for setting, generator in MergeTreeSettingsRandomizer.settings.items():
            if setting not in args.changed_merge_tree_settings:
                random_settings[setting] = generator()
        return random_settings


def replace_in_file(filename, what, with_what):
    os.system(f"LC_ALL=C sed -i -e 's|{what}|{with_what}|g' {filename}")


class TestResult:
    def __init__(
        self,
        case_name: str,
        status: TestStatus,
        reason: Optional[FailureReason],
        total_time: float,
        description: str,
    ):
        self.case_name: str = case_name
        self.status: TestStatus = status
        self.reason: Optional[FailureReason] = reason
        self.total_time: float = total_time
        self.description: str = description
        self.need_retry: bool = False

    def check_if_need_retry(self, args, stdout, stderr, runs_count):
        if (
            self.status != TestStatus.FAIL
            or not need_retry(args, stdout, stderr, self.total_time)
            or MAX_RETRIES < runs_count
        ):
            return
        self.need_retry = True


class TestCase:
    @staticmethod
    def get_description_from_exception_info(exc_info):
        exc_type, exc_value, tb = exc_info
        exc_name = exc_type.__name__
        traceback_str = "\n".join(traceback.format_tb(tb, 10))
        description = f"\n{exc_name}\n{exc_value}\n{traceback_str}"
        return description

    @staticmethod
    def get_reference_file(suite_dir, name):
        """
        Returns reference file name for specified test
        """

        name = removesuffix(name, ".gen")
        for ext in [".reference", ".gen.reference"]:
            reference_file = os.path.join(suite_dir, name) + ext
            if os.path.isfile(reference_file):
                return reference_file
        return None

    @staticmethod
    def configure_testcase_args(args, case_file, suite_tmp_dir):
        testcase_args = copy.deepcopy(args)

        testcase_args.testcase_start_time = datetime.now()
        testcase_basename = os.path.basename(case_file)
        testcase_args.testcase_client = (
            f"{testcase_args.client} --log_comment '{testcase_basename}'"
        )
        testcase_args.testcase_basename = testcase_basename

        if testcase_args.database:
            database = testcase_args.database
            os.environ.setdefault("CLICKHOUSE_DATABASE", database)
            os.environ.setdefault("CLICKHOUSE_TMP", suite_tmp_dir)
            testcase_args.test_tmp_dir = suite_tmp_dir
        else:
            # If --database is not specified, we will create temporary database with
            # unique name and we will recreate and drop it for each test
            def random_str(length=8):
                alphabet = string.ascii_lowercase + string.digits
                # NOTE: it is important not to use default random generator, since it shares state.
                return "".join(
                    random.SystemRandom().choice(alphabet) for _ in range(length)
                )

            database = f"test_{random_str()}"

            clickhouse_execute(
                args,
                "CREATE DATABASE IF NOT EXISTS "
                + database
                + get_db_engine(testcase_args, database),
                settings=get_create_database_settings(args, testcase_args),
            )

            os.environ["CLICKHOUSE_DATABASE"] = database
            # Set temporary directory to match the randomly generated database,
            # because .sh tests also use it for temporary files and we want to avoid
            # collisions.
            testcase_args.test_tmp_dir = os.path.join(suite_tmp_dir, database)
            os.mkdir(testcase_args.test_tmp_dir)
            os.environ["CLICKHOUSE_TMP"] = testcase_args.test_tmp_dir

        testcase_args.testcase_database = database

        # Printed only in case of failures
        #
        # NOTE: here we use "CLICKHOUSE_TMP" instead of "file_suffix",
        # so it is installed in configure_testcase_args() unlike other files
        # (stdout_file, stderr_file) in TestCase::__init__().
        # Since using CLICKHOUSE_TMP is easier to use in expect.
        testcase_args.debug_log_file = (
            os.path.join(testcase_args.test_tmp_dir, testcase_basename) + ".debuglog"
        )

        return testcase_args

    @staticmethod
    def cli_format_settings(settings_list) -> str:
        out = []
        for k, v in settings_list.items():
            out.extend([f"--{k}", str(v)])
        return " ".join(out)

    @staticmethod
    def http_format_settings(settings_list) -> str:
        return urllib.parse.urlencode(settings_list)

    def has_show_create_table_in_test(self):
        return not subprocess.call(["grep", "-iq", "show create", self.case_file])

    def add_random_settings(self, client_options):
        new_options = ""
        if self.randomize_settings:
            http_params = self.http_format_settings(self.random_settings)
            if len(self.base_url_params) == 0:
                os.environ["CLICKHOUSE_URL_PARAMS"] = http_params
            else:
                os.environ["CLICKHOUSE_URL_PARAMS"] = (
                    self.base_url_params + "&" + http_params
                )

            new_options += f" {self.cli_format_settings(self.random_settings)}"

        if self.randomize_merge_tree_settings:
            new_options += f" --allow_merge_tree_settings {self.cli_format_settings(self.merge_tree_random_settings)}"

        if new_options != "":
            new_options += " --allow_repeated_settings"

            os.environ["CLICKHOUSE_CLIENT_OPT"] = (
                self.base_client_options + new_options + " "
            )

        return client_options + new_options

    def remove_random_settings_from_env(self):
        os.environ["CLICKHOUSE_URL_PARAMS"] = self.base_url_params
        os.environ["CLICKHOUSE_CLIENT_OPT"] = self.base_client_options

    def add_info_about_settings(self, description):
        if self.randomize_settings:
            description += f"\nSettings used in the test: {self.cli_format_settings(self.random_settings)}"
        if self.randomize_merge_tree_settings:
            description += f"\n\nMergeTree settings used in test: {self.cli_format_settings(self.merge_tree_random_settings)}"

        return description + "\n"

    def apply_random_settings_limits(self, random_settings):
        for setting in random_settings:
            if setting in self.random_settings_limits:
                min_value = self.random_settings_limits[setting][0]
                if min_value and random_settings[setting] < min_value:
                    random_settings[setting] = min_value
                max_value = self.random_settings_limits[setting][1]
                if max_value and random_settings[setting] > max_value:
                    random_settings[setting] = max_value

    def __init__(self, suite, case: str, args, is_concurrent: bool):
        self.case: str = case  # case file name
        self.tags: Set[str] = suite.all_tags[case] if case in suite.all_tags else set()
        self.random_settings_limits = (
            suite.all_random_settings_limits[case]
            if case in suite.all_random_settings_limits
            else {}
        )

        for tag in os.getenv("GLOBAL_TAGS", "").split(","):
            self.tags.add(tag.strip())

        self.case_file: str = os.path.join(suite.suite_path, case)
        (self.name, self.ext) = os.path.splitext(case)

        file_suffix = f".{os.getpid()}" if is_concurrent and args.test_runs > 1 else ""
        self.reference_file = self.get_reference_file(suite.suite_path, self.name)
        self.stdout_file = (
            os.path.join(suite.suite_tmp_path, self.name) + file_suffix + ".stdout"
        )
        self.stderr_file = (
            os.path.join(suite.suite_tmp_path, self.name) + file_suffix + ".stderr"
        )

        self.testcase_args = None
        self.runs_count = 0

        has_no_random_settings_tag = self.tags and "no-random-settings" in self.tags

        self.randomize_settings = not (
            args.no_random_settings or has_no_random_settings_tag
        )

        has_no_random_merge_tree_settings_tag = (
            self.tags and "no-random-merge-tree-settings" in self.tags
        )

        # If test contains SHOW CREATE TABLE do not
        # randomize merge tree settings, because
        # they will be added to table definition and test will fail
        self.randomize_merge_tree_settings = not (
            args.no_random_merge_tree_settings
            or has_no_random_settings_tag
            or has_no_random_merge_tree_settings_tag
            or self.has_show_create_table_in_test()
        )

        if self.randomize_settings:
            self.random_settings = SettingsRandomizer.get_random_settings(args)
            self.apply_random_settings_limits(self.random_settings)

        if self.randomize_merge_tree_settings:
            self.merge_tree_random_settings = (
                MergeTreeSettingsRandomizer.get_random_settings(args)
            )
            self.apply_random_settings_limits(self.merge_tree_random_settings)

        self.base_url_params = (
            os.environ["CLICKHOUSE_URL_PARAMS"]
            if "CLICKHOUSE_URL_PARAMS" in os.environ
            else ""
        )

        self.base_client_options = (
            os.environ["CLICKHOUSE_CLIENT_OPT"]
            if "CLICKHOUSE_CLIENT_OPT" in os.environ
            else ""
        )

        self.show_whitespaces_in_diff = args.show_whitespaces_in_diff

    # should skip test, should increment skipped_total, skip reason
    def should_skip_test(self, suite) -> Optional[FailureReason]:
        tags = self.tags

        if tags and ("disabled" in tags) and not args.disabled:
            return FailureReason.DISABLED

        if args.private and self.name in suite.private_skip_list:
            return FailureReason.NOT_SUPPORTED_IN_PRIVATE

        if args.cloud and ("no-replicated-database" in tags):
            return FailureReason.REPLICATED_DB

        if args.cloud and self.name in suite.cloud_skip_list:
            return FailureReason.NOT_SUPPORTED_IN_CLOUD

        if (
            os.path.exists(os.path.join(suite.suite_path, self.name) + ".disabled")
            and not args.disabled
        ):
            return FailureReason.DISABLED

        if "no-parallel-replicas" in tags and args.no_parallel_replicas:
            return FailureReason.NO_PARALLEL_REPLICAS

        if args.skip and any(s in self.name for s in args.skip):
            return FailureReason.SKIP

        if not USE_JINJA and self.ext.endswith("j2"):
            return FailureReason.NO_JINJA

        if (
            tags
            and (("zookeeper" in tags) or ("replica" in tags))
            and not args.zookeeper
        ):
            return FailureReason.NO_ZOOKEEPER

        if (
            tags
            and (("shard" in tags) or ("distributed" in tags) or ("global" in tags))
            and not args.shard
        ):
            return FailureReason.NO_SHARD

        if tags and ("no-fasttest" in tags) and args.fast_tests_only:
            return FailureReason.FAST_ONLY

        if (
            tags
            and (("long" in tags) or ("deadlock" in tags) or ("race" in tags))
            and args.no_long
        ):
            # Tests for races and deadlocks usually are run in a loop for a significant amount of time
            return FailureReason.NO_LONG

        if tags and ("no-replicated-database" in tags) and args.replicated_database:
            return FailureReason.REPLICATED_DB

        if tags and ("no-distributed-cache" in tags) and args.distributed_cache:
            return FailureReason.DISTRIBUTED_CACHE

        if (
            tags
            and ("atomic-database" in tags)
            and (args.replicated_database or args.db_engine not in (None, "Atomic"))
        ):
            return FailureReason.NON_ATOMIC_DB

        if (
            tags
            and ("no-shared-merge-tree" in tags)
            and args.replace_replicated_with_shared
        ):
            return FailureReason.SHARED_MERGE_TREE

        if tags and ("no-s3-storage" in tags) and args.s3_storage:
            return FailureReason.S3_STORAGE
        if tags and ("no-azure-blob-storage" in tags) and args.azure_blob_storage:
            return FailureReason.AZURE_BLOB_STORAGE
        if (
            tags
            and ("no-object-storage" in tags)
            and (args.azure_blob_storage or args.s3_storage)
        ):
            return FailureReason.OBJECT_STORAGE
        if (
            tags
            and "no-object-storage-with-slow-build" in tags
            and (args.s3_storage or args.azure_blob_storage)
            and BuildFlags.RELEASE not in args.build_flags
        ):
            return FailureReason.OBJECT_STORAGE

        if "no-batch" in tags and (
            args.run_by_hash_num is not None or args.run_by_hash_total is not None
        ):
            return FailureReason.SKIP

        if "no-flaky-check" in tags and (1 == int(os.environ.get("IS_FLAKY_CHECK", 0))):
            return FailureReason.SKIP

        if tags:
            for build_flag in args.build_flags:
                if "no-" + build_flag in tags:
                    return FailureReason.BUILD
            for tag in tags:
                tag = tag.replace("-", "_")
                if tag.startswith("use_") and tag not in args.build_flags:
                    return FailureReason.BUILD

        return None

    def process_result_impl(self, proc, total_time: float):
        kill_output = ""
        if proc:
            if proc.returncode is None:
                f = io.StringIO()
                with redirect_stdout(f):
                    kill_process_group(os.getpgid(proc.pid))
                kill_output = f.getvalue()

        description = ""

        debug_log = ""
        if os.path.exists(self.testcase_args.debug_log_file):
            with open(self.testcase_args.debug_log_file, "rb") as stream:
                debug_log += self.testcase_args.debug_log_file + ":\n"
                debug_log += str(stream.read(), errors="replace", encoding="utf-8")
                debug_log += "\n"

        stdout = ""
        if os.path.exists(self.stdout_file):
            with open(self.stdout_file, "rb") as stdfd:
                stdout = str(stdfd.read(), errors="replace", encoding="utf-8")

        stderr = kill_output
        if os.path.exists(self.stderr_file):
            with open(self.stderr_file, "rb") as stdfd:
                stderr += str(stdfd.read(), errors="replace", encoding="utf-8")

        if debug_log:
            debug_log = "\n".join(debug_log.splitlines()[:100])

        if proc:
            if proc.returncode is None:
                if stderr:
                    description += stderr
                if debug_log:
                    description += "\n"
                    description += debug_log
                return TestResult(
                    self.name,
                    TestStatus.FAIL,
                    FailureReason.TIMEOUT,
                    total_time,
                    description,
                )

            if proc.returncode != 0:
                reason = FailureReason.EXIT_CODE
                description += str(proc.returncode)

                if stderr:
                    description += "\n"
                    description += stderr
                if debug_log:
                    description += "\n"
                    description += debug_log

                # Stop on fatal errors like segmentation fault. They are sent to client via logs.
                if " <Fatal> " in stderr:
                    reason = FailureReason.SERVER_DIED

                if (
                    self.testcase_args.stop
                    and (
                        "Connection refused" in stderr
                        or "Attempt to read after eof" in stderr
                    )
                    and "Received exception from server" not in stderr
                ):
                    reason = FailureReason.SERVER_DIED

                if os.path.isfile(self.stdout_file):
                    description += ", result:\n\n"
                    with open(self.stdout_file, "rb") as f:
                        description += trim_for_log(
                            f.read().decode("utf-8", errors="ignore")
                        )
                    description += "\n"

                description += f"\nstdout:\n{stdout}\n"
                return TestResult(
                    self.name, TestStatus.FAIL, reason, total_time, description
                )

        if stderr:
            description += "\n"
            description += trim_for_log(stderr)
            description += "\n"
            description += "\nstdout:\n"
            description += trim_for_log(stdout)
            description += "\n"

            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.STDERR,
                total_time,
                description,
            )

        if "Exception" in stdout:
            description += "\n{}\n".format("\n".join(stdout.splitlines()[:100]))
            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.EXCEPTION,
                total_time,
                description,
            )

        if "@@SKIP@@" in stdout:
            skip_reason = stdout.replace("@@SKIP@@", "").rstrip("\n")
            description += " - "
            description += skip_reason
            return TestResult(
                self.name,
                TestStatus.SKIPPED,
                FailureReason.SKIP,
                total_time,
                description,
            )

        if self.reference_file is None:
            return TestResult(
                self.name,
                TestStatus.UNKNOWN,
                FailureReason.NO_REFERENCE,
                total_time,
                description,
            )

        result_is_different = subprocess.call(
            ["diff", "-q", self.reference_file, self.stdout_file], stdout=PIPE
        )

        if result_is_different:
            with Popen(
                [
                    "diff",
                    "-U",
                    str(self.testcase_args.unified),
                    self.reference_file,
                    self.stdout_file,
                ],
                stdout=PIPE,
                universal_newlines=True,
            ) as diff_proc:
                if self.show_whitespaces_in_diff:
                    with Popen(
                        ["sed", "-e", "s/[ \t]\\+$/&$/g"],
                        stdin=diff_proc.stdout,
                        stdout=PIPE,
                    ) as sed_proc:
                        diff = sed_proc.communicate()[0].decode(
                            "utf-8", errors="ignore"
                        )
                else:
                    diff = diff_proc.communicate()[0]

            if diff.startswith("Binary files "):
                diff += "Content of stdout:\n===================\n"
                with open(self.stdout_file, "rb") as file:
                    diff += str(file.read())
                diff += "==================="
            description += f"\n{diff}\n"
            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.RESULT_DIFF,
                total_time,
                description,
            )

        if (
            self.testcase_args.test_runs > 1
            and total_time > TEST_MAX_RUN_TIME_IN_SECONDS
            and "long" not in self.tags
        ):
            if debug_log:
                description += "\n"
                description += debug_log
            # We're in Flaky Check mode, check the run time as well while we're at it.
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.TOO_LONG,
                total_time,
                description,
            )

        if os.path.exists(self.stdout_file):
            os.remove(self.stdout_file)
        if os.path.exists(self.stderr_file):
            os.remove(self.stderr_file)
        if os.path.exists(self.testcase_args.debug_log_file):
            os.remove(self.testcase_args.debug_log_file)

        return TestResult(self.name, TestStatus.OK, None, total_time, description)

    @staticmethod
    def print_test_time(test_time) -> str:
        if args.print_time:
            return f" {test_time:.2f} sec."
        return ""

    def process_result(self, result: TestResult, messages):
        description_full = messages[result.status]
        description_full += self.print_test_time(result.total_time)
        if result.reason is not None:
            description_full += f"\nReason: {result.reason.value} "

        description_full += result.description

        if (
            args.collect_per_test_coverage
            and BuildFlags.SANITIZE_COVERAGE in args.build_flags
        ):
            try:
                clickhouse_execute(
                    args,
                    f"INSERT INTO system.coverage_log SELECT now(), '{self.case}', coverageCurrent()",
                    retry_error_codes=True,
                )
            except Exception as e:
                print("Cannot insert coverage data: ", str(e))

            # Check for dumped coverage files
            file_pattern = "coverage.*"
            matching_files = glob.glob(file_pattern)
            for file_path in matching_files:
                try:
                    body = read_file_as_binary_string(file_path)
                    clickhouse_execute(
                        args,
                        "INSERT INTO system.coverage_log "
                        "SETTINGS async_insert=1, wait_for_async_insert=0, async_insert_busy_timeout_min_ms=200, async_insert_busy_timeout_max_ms=1000 "
                        f"SELECT now(), '{self.case}', groupArray(data) FROM input('data UInt64') FORMAT RowBinary",
                        body=body,
                        retry_error_codes=True,
                    )
                except Exception as e:
                    print("Cannot insert coverage data: ", str(e))
                # Remove the file even in case of exception to avoid accumulation and quadratic complexity.
                os.remove(file_path)

            _ = clickhouse_execute(args, "SYSTEM FLUSH ASYNC INSERT QUEUE")

            coverage = clickhouse_execute(
                args,
                "SELECT length(coverageCurrent())",
                retry_error_codes=True,
            ).decode()

            description_full += f" (coverage: {coverage})"

        description_full += "\n"

        if result.status == TestStatus.FAIL and self.testcase_args:
            description_full += "Database: " + self.testcase_args.testcase_database

        result.description = description_full
        return result

    @staticmethod
    def send_test_name_failed(suite: str, case: str):
        pid = os.getpid()
        clickhouse_execute(
            args,
            f"SELECT 'Running test {suite}/{case} from pid={pid}'",
            retry_error_codes=True,
        )

    def run_single_test(
        self, server_logs_level, client_options
    ) -> Tuple[Optional[Popen], float]:
        args = self.testcase_args
        client = args.testcase_client
        start_time = args.testcase_start_time
        database = args.testcase_database

        if args.client_log:
            log_opt = " --client_logs_file=" + args.client_log + " "
            client_options += log_opt

            for env_name in [
                "TSAN_OPTIONS",
                "ASAN_OPTIONS",
                "MSAN_OPTIONS",
                "UBSAN_OPTIONS",
            ]:
                current_options = os.environ.get(env_name, None)
                if current_options is None:
                    os.environ[env_name] = f"log_path={args.client_log}"
                elif "log_path=" not in current_options:
                    os.environ[env_name] += f":log_path={args.client_log}"

            os.environ["CLICKHOUSE_CLIENT_OPT"] = (
                os.environ["CLICKHOUSE_CLIENT_OPT"]
                if "CLICKHOUSE_CLIENT_OPT" in os.environ
                else ""
            ) + log_opt

        # This is for .sh tests
        os.environ["CLICKHOUSE_LOG_COMMENT"] = args.testcase_basename

        query_params = ""
        if "need-query-parameters" in self.tags:
            query_params = (
                " --param_CLICKHOUSE_DATABASE="
                + database
                + " --param_CLICKHOUSE_DATABASE_1="
                + database
                + "_1"
            )

        params = {
            "client": client + " --database=" + database + query_params,
            "logs_level": server_logs_level,
            "options": client_options,
            "test": self.case_file,
            "stdout": self.stdout_file,
            "stderr": self.stderr_file,
            "secure": "--secure" if args.secure else "",
        }

        # >> append to stderr (but not stdout since it is not used there),
        # because there are also output of per test database creation
        pattern = "{test} > {stdout} 2> {stderr}"

        if self.ext == ".sql" and args.cloud:
            # Get at least some logs, because we don't have access to system.text_log and pods...
            pattern = (
                "{client} --send_logs_level={logs_level} {secure} --multiquery {options}"
                " --send_logs_level=trace < {test} > {stdout}  2>> /test_output/some_logs_from_server.log"
            )
        elif self.ext == ".sql" and not args.cloud:
            pattern = (
                "{client} --send_logs_level={logs_level} {secure} --multiquery {options} < "
                + pattern
            )

        # We want to calculate per-test code coverage. That's why we reset it before each test.
        if (
            args.collect_per_test_coverage
            and args.reset_coverage_before_every_test
            and BuildFlags.SANITIZE_COVERAGE in args.build_flags
        ):
            clickhouse_execute(
                args,
                "SYSTEM RESET COVERAGE",
                retry_error_codes=True,
            )

        command = pattern.format(**params)

        # pylint:disable-next=consider-using-with; TODO: fix
        proc = Popen(command, shell=True, env=os.environ, start_new_session=True)

        try:
            proc.wait(args.timeout)
        except subprocess.TimeoutExpired:
            # Whether the test timed out will be decided later
            pass

        total_time = (datetime.now() - start_time).total_seconds()

        # Normalize randomized database names in stdout, stderr files.
        replace_in_file(self.stdout_file, database, "default")
        if args.hide_db_name:
            replace_in_file(self.stderr_file, database, "default")
        if args.replicated_database:
            replace_in_file(self.stdout_file, "/auto_{shard}", "")
            replace_in_file(self.stdout_file, "auto_{replica}", "")

        # Normalize hostname in stdout file.
        replace_in_file(self.stdout_file, socket.gethostname(), "localhost")

        if os.environ.get("CLICKHOUSE_PORT_TCP"):
            replace_in_file(
                self.stdout_file,
                f"PORT {os.environ['CLICKHOUSE_PORT_TCP']}",
                "PORT 9000",
            )
            replace_in_file(
                self.stdout_file,
                f"localhost	{os.environ['CLICKHOUSE_PORT_TCP']}",
                "localhost	9000",
            )

        if os.environ.get("CLICKHOUSE_PORT_TCP_SECURE"):
            replace_in_file(
                self.stdout_file,
                f"PORT {os.environ['CLICKHOUSE_PORT_TCP_SECURE']}",
                "PORT 9440",
            )
            replace_in_file(
                self.stdout_file,
                f"localhost	{os.environ['CLICKHOUSE_PORT_TCP_SECURE']}",
                "localhost	9440",
            )

        if os.environ.get("CLICKHOUSE_PATH"):
            replace_in_file(
                self.stdout_file,
                os.environ["CLICKHOUSE_PATH"],
                "/var/lib/clickhouse",
            )

        if os.environ.get("CLICKHOUSE_PORT_HTTPS"):
            replace_in_file(
                self.stdout_file,
                f"https://localhost:{os.environ['CLICKHOUSE_PORT_HTTPS']}/",
                "https://localhost:8443/",
            )

        return proc, total_time

    def run(self, args, suite, client_options, server_logs_level):
        start_time = datetime.now()

        try:
            skip_reason = self.should_skip_test(suite)
            if skip_reason is not None:
                return TestResult(self.name, TestStatus.SKIPPED, skip_reason, 0.0, "")

            if args.testname:
                try:
                    self.send_test_name_failed(suite.suite, self.case)
                except Exception:
                    return TestResult(
                        self.name,
                        TestStatus.FAIL,
                        FailureReason.SERVER_DIED,
                        0.0,
                        "\nServer does not respond to health check\n",
                    )

            self.runs_count += 1
            self.testcase_args = self.configure_testcase_args(
                args, self.case_file, suite.suite_tmp_path
            )

            client_options = self.add_random_settings(client_options)

            if not is_valid_utf_8(self.case_file) or (
                self.reference_file and not is_valid_utf_8(self.reference_file)
            ):
                proc, total_time = self.run_single_test(
                    server_logs_level, client_options
                )

                result = self.process_result_impl(proc, total_time)
                result.check_if_need_retry(
                    args, result.description, result.description, self.runs_count
                )
                # to avoid breaking CSV parser
                result.description = result.description.replace("\0", "")
            else:
                with SharedEngineReplacer(
                    self.case_file,
                    args.replace_replicated_with_shared,
                    args.replace_non_replicated_with_shared,
                    False,
                ):
                    with SharedEngineReplacer(
                        self.reference_file,
                        args.replace_replicated_with_shared,
                        args.replace_non_replicated_with_shared,
                        True,
                    ):
                        (
                            proc,
                            total_time,
                        ) = self.run_single_test(server_logs_level, client_options)

                        result = self.process_result_impl(proc, total_time)

                        result.check_if_need_retry(
                            args,
                            result.description,
                            result.description,
                            self.runs_count,
                        )
                        # to avoid breaking CSV parser
                        result.description = result.description.replace("\0", "")
            if result.status == TestStatus.FAIL:
                result.description = self.add_info_about_settings(result.description)

            self._cleanup(result.status == TestStatus.OK)

            return result
        except KeyboardInterrupt as e:
            raise e
        except HTTPError:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.INTERNAL_QUERY_FAIL,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except socket.timeout:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.TIMEOUT,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except (ConnectionError, http.client.ImproperConnectionState):
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.SERVER_DIED,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except Exception:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.UNKNOWN,
                FailureReason.INTERNAL_ERROR,
                total_time,
                self.get_description_from_exception_info(sys.exc_info()),
            )
        finally:
            self.remove_random_settings_from_env()

    def _cleanup(self, passed):
        args = self.testcase_args

        need_cleanup = not args.database
        if need_cleanup and args.no_drop_if_fail:
            need_cleanup = passed

        if not need_cleanup:
            return

        time_passed = (datetime.now() - args.testcase_start_time).total_seconds()
        timeout = max(args.timeout - time_passed, 20)

        self._cleanup_database(args, timeout)
        shutil.rmtree(args.test_tmp_dir)

    def _cleanup_database(self, args, timeout):
        database = args.testcase_database

        # Check if the test does not cleanup its tables.
        # Only for newly added tests. Please extend this check to the old tests as well.
        if self.case_file >= "02800":
            leftover_tables = (
                clickhouse_execute(
                    args,
                    f"SHOW TABLES FROM {database}",
                    timeout=timeout,
                    settings={
                        "log_comment": args.testcase_basename,
                    },
                )
                .decode()
                .replace("\n", ", ")
            )

            if len(leftover_tables) != 0:
                raise TestException(
                    f"The test should cleanup its tables ({leftover_tables}), otherwise it is inconvenient for running it locally."
                )

        drop_database_query = f"DROP DATABASE IF EXISTS {database}"
        if args.replicated_database:
            drop_database_query += " ON CLUSTER test_cluster_database_replicated"

        # It's possible to get an error "New table appeared in database being dropped or detached. Try again."
        for _ in range(1, 60):
            try:
                clickhouse_execute(
                    args,
                    drop_database_query,
                    timeout=timeout,
                    settings={
                        "log_comment": args.testcase_basename,
                    },
                )
            except HTTPError as e:
                if need_retry(args, e.message, e.message, 0):
                    continue
                raise
            break


class TestSuite:
    @staticmethod
    def tests_in_suite_key_func(item: str) -> float:
        if args.order == "random":
            return random.random()

        reverse = 1 if args.order == "asc" else -1

        if -1 == item.find("_"):
            return 99998

        prefix, _ = item.split("_", 1)

        try:
            return reverse * int(prefix)
        except ValueError:
            return 99997

    @staticmethod
    def render_test_template(j2env, suite_dir, test_name):
        """
        Render template for test and reference file if needed
        """

        if j2env is None:
            return test_name

        test_base_name = removesuffix(test_name, ".sql.j2", ".sql")

        reference_file_name = test_base_name + ".reference.j2"
        reference_file_path = os.path.join(suite_dir, reference_file_name)
        if os.path.isfile(reference_file_path):
            tpl = j2env.get_template(reference_file_name)
            tpl.stream().dump(
                os.path.join(suite_dir, test_base_name) + ".gen.reference"
            )

        if test_name.endswith(".sql.j2"):
            tpl = j2env.get_template(test_name)
            generated_test_name = test_base_name + ".gen.sql"
            tpl.stream().dump(os.path.join(suite_dir, generated_test_name))
            return generated_test_name

        return test_name

    @staticmethod
    def read_test_tags_and_random_settings_limits(
        suite_dir: str, all_tests: List[str]
    ) -> (Dict[str, Set[str]], Dict[str, Dict[str, Tuple[int, int]]]):
        def get_comment_sign(filename):
            if filename.endswith(".sql") or filename.endswith(".sql.j2"):
                return "--"
            if (
                filename.endswith(".sh")
                or filename.endswith(".py")
                or filename.endswith(".expect")
            ):
                return "#"
            raise TestException(f"Unknown file_extension: {filename}")

        def parse_tags_from_line(line, comment_sign) -> Set[str]:
            if not line.startswith(comment_sign):
                return set()
            tags_str = line[len(comment_sign) :].lstrip()  # noqa: ignore E203
            tags_prefix = "Tags:"
            if not tags_str.startswith(tags_prefix):
                return set()
            tags_str = tags_str[len(tags_prefix) :]  # noqa: ignore E203
            tags = tags_str.split(",")
            tags = {tag.strip() for tag in tags}
            return tags

        def parse_random_settings_limits_from_line(
            line, comment_sign
        ) -> Dict[str, Tuple[int, int]]:
            if not line.startswith(comment_sign):
                return {}
            random_settings_limits_str = line[len(comment_sign) :].lstrip()
            random_settings_limits_prefix = "Random settings limits:"
            if not random_settings_limits_str.startswith(random_settings_limits_prefix):
                return {}
            random_settings_limits_str = random_settings_limits_str[
                len(random_settings_limits_prefix) :
            ]
            # limits are specified in a form 'setting1=(min, max); setting2=(min,max); ...'
            random_settings_limits = {}
            for setting_and_limit in random_settings_limits_str.split(";"):
                setting_and_limit = setting_and_limit.split("=")
                random_settings_limits[setting_and_limit[0].strip()] = make_tuple(
                    setting_and_limit[1]
                )
            return random_settings_limits

        def find_tag_line(lines, comment_sign):
            for line in lines:
                if line.startswith(comment_sign) and line[
                    len(comment_sign) :
                ].lstrip().startswith("Tags:"):
                    return line
            return ""

        def find_random_settings_limits_line(lines, comment_sign):
            for line in lines:
                if line.startswith(comment_sign) and line[
                    len(comment_sign) :
                ].lstrip().startswith("Random settings limits:"):
                    return line
            return ""

        def load_tags_and_random_settings_limits_from_file(filepath):
            comment_sign = get_comment_sign(filepath)
            need_query_params = False
            with open(filepath, "r", encoding="utf-8") as file:
                try:
                    lines = file.readlines()
                    tag_line = find_tag_line(lines, comment_sign)
                    random_settings_limits_line = find_random_settings_limits_line(
                        lines, comment_sign
                    )
                except UnicodeDecodeError:
                    return [], {}
                try:
                    if filepath.endswith(".sql"):
                        for line in lines:
                            if "{CLICKHOUSE_DATABASE" in line:
                                need_query_params = True
                except UnicodeDecodeError:
                    pass
            parsed_tags = parse_tags_from_line(tag_line, comment_sign)
            if need_query_params:
                parsed_tags.add("need-query-parameters")
            random_settings_limits = parse_random_settings_limits_from_line(
                random_settings_limits_line, comment_sign
            )
            return parsed_tags, random_settings_limits

        all_tags = {}
        all_random_settings_limits = {}
        start_time = datetime.now()
        for test_name in all_tests:
            (
                tags,
                random_settings_limits,
            ) = load_tags_and_random_settings_limits_from_file(
                os.path.join(suite_dir, test_name)
            )  # noqa: ignore E203
            if tags:
                all_tags[test_name] = tags
            if random_settings_limits:
                all_random_settings_limits[test_name] = random_settings_limits
        elapsed = (datetime.now() - start_time).total_seconds()
        if elapsed > 1:
            print(
                f"Tags and random settings limits for suite {suite_dir} read in {elapsed:.2f} seconds"
            )
        return all_tags, all_random_settings_limits

    def __init__(self, args, suite_path: str, suite_tmp_path: str, suite: str):
        self.args = args
        self.suite_path: str = suite_path
        self.suite_tmp_path: str = suite_tmp_path
        self.suite: str = suite
        self.cloud_skip_list: List[str] = []
        self.private_skip_list: List[str] = []

        if args.run_by_hash_num is not None and args.run_by_hash_total is not None:
            if args.run_by_hash_num > args.run_by_hash_total:
                raise TestException(
                    f"Incorrect run by hash, value {args.run_by_hash_num} bigger than total {args.run_by_hash_total}"
                )

            def filter_func(x: str) -> bool:
                return bool(
                    stringhash(x) % args.run_by_hash_total == args.run_by_hash_num
                )

        else:

            def filter_func(x: str) -> bool:
                _ = x
                return True

        self.all_tests: List[str] = self.get_tests_list(
            self.tests_in_suite_key_func, filter_func
        )

        all_tags_and_random_settings_limits = (
            self.read_test_tags_and_random_settings_limits(
                self.suite_path, self.all_tests
            )
        )
        self.all_tags: Dict[str, Set[str]] = all_tags_and_random_settings_limits[0]
        self.all_random_settings_limits: Dict[str, Dict[str, (int, int)]] = (
            all_tags_and_random_settings_limits[1]
        )
        self.sequential_tests = []
        self.parallel_tests = []
        for test_name in self.all_tests:
            if self.is_sequential_test(test_name):
                self.sequential_tests.append(test_name)
            else:
                self.parallel_tests.append(test_name)

    def is_sequential_test(self, test_name):
        if args.sequential:
            if any(s in test_name for s in args.sequential):
                return True

        if test_name not in self.all_tags:
            return False

        return ("no-parallel" in self.all_tags[test_name]) or (
            "sequential" in self.all_tags[test_name]
        )

    def get_tests_list(self, sort_key, filter_func):
        """
        Return list of tests file names to run
        """

        all_tests = list(self.get_selected_tests(filter_func))
        all_tests = all_tests * self.args.test_runs
        all_tests.sort(key=sort_key)
        return all_tests

    def get_selected_tests(self, filter_func):
        """
        Find all files with tests, filter, render templates
        """

        j2env = (
            jinja2.Environment(
                loader=jinja2.FileSystemLoader(self.suite_path),
                keep_trailing_newline=True,
            )
            if USE_JINJA
            else None
        )
        if j2env is not None:
            j2env.globals.update(product=itertools.product)

        for test_name in os.listdir(self.suite_path):
            if not is_test_from_dir(self.suite_path, test_name):
                continue
            if self.args.test and not any(
                re.search(pattern, test_name) for pattern in self.args.test
            ):
                continue
            if USE_JINJA and test_name.endswith(".gen.sql"):
                continue
            if not filter_func(test_name):
                continue
            test_name = self.render_test_template(j2env, self.suite_path, test_name)
            yield test_name

    @staticmethod
    def read_test_suite(args, suite_dir_name: str):
        def is_data_present():
            try:
                return int(clickhouse_execute(args, "EXISTS TABLE test.hits"))
            except Exception as e:
                print(
                    "Cannot check if dataset is available, assuming it's not: ", str(e)
                )
                return False

        base_dir = os.path.abspath(args.queries)
        tmp_dir = os.path.abspath(args.tmp)
        suite_path = os.path.join(base_dir, suite_dir_name)

        suite_re_obj = re.search("^[0-9]+_(.*)$", suite_dir_name)
        if not suite_re_obj:  # skip .gitignore and so on
            return None

        suite_tmp_path = os.path.join(tmp_dir, suite_dir_name)
        if not os.path.exists(suite_tmp_path):
            os.makedirs(suite_tmp_path)

        suite = suite_re_obj.group(1)

        if not os.path.isdir(suite_path):
            return None

        if "stateful" in suite and not args.no_stateful and not is_data_present():
            print("Won't run stateful tests because test data wasn't loaded.")
            return None
        if "stateless" in suite and args.no_stateless:
            print("Won't run stateless tests because they were manually disabled.")
            return None
        if "stateful" in suite and args.no_stateful:
            print("Won't run stateful tests because they were manually disabled.")
            return None

        return TestSuite(args, suite_path, suite_tmp_path, suite)


stop_time = None
exit_code = None
server_died = None
multiprocessing_manager = None
restarted_tests = None


class ServerDied(Exception):
    pass


class GlobalTimeout(Exception):
    pass


def run_tests_array(all_tests_with_params: Tuple[List[str], int, TestSuite, bool]):
    (
        all_tests,
        num_tests,
        test_suite,
        is_concurrent,
    ) = all_tests_with_params
    global stop_time
    global exit_code
    global server_died
    global restarted_tests

    OP_SQUARE_BRACKET = colored("[", args, attrs=["bold"])
    CL_SQUARE_BRACKET = colored("]", args, attrs=["bold"])

    MSG_FAIL = (
        OP_SQUARE_BRACKET
        + colored(" FAIL ", args, "red", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_UNKNOWN = (
        OP_SQUARE_BRACKET
        + colored(" UNKNOWN ", args, "yellow", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_OK = (
        OP_SQUARE_BRACKET
        + colored(" OK ", args, "green", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_SKIPPED = (
        OP_SQUARE_BRACKET
        + colored(" SKIPPED ", args, "cyan", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )

    MESSAGES = {
        TestStatus.FAIL: MSG_FAIL,
        TestStatus.UNKNOWN: MSG_UNKNOWN,
        TestStatus.OK: MSG_OK,
        TestStatus.SKIPPED: MSG_SKIPPED,
    }

    passed_total = 0
    skipped_total = 0
    failures_total = 0
    failures_chain = 0
    start_time = datetime.now()

    client_options = get_additional_client_options(args)

    if num_tests > 0:
        about = "about " if is_concurrent else ""
        proc_name = multiprocessing.current_process().name
        print(f"Running {about}{num_tests} {test_suite.suite} tests ({proc_name}).")

    while True:
        if all_tests:
            try:
                case = all_tests.pop(0)
            except IndexError:
                break
        else:
            break

        if server_died.is_set():
            stop_tests()
            raise ServerDied("Server died")

        if stop_time and time() > stop_time:
            print("\nStop tests run because global time limit is exceeded.\n")
            stop_tests()
            raise GlobalTimeout("Stop tests run because global time limit is exceeded")

        test_case = TestCase(test_suite, case, args, is_concurrent)

        try:
            description = ""
            test_case_name = removesuffix(test_case.name, ".gen", ".sql") + ": "

            if is_concurrent:
                description = f"{test_case_name:72}"
            else:
                sys.stdout.flush()
                sys.stdout.write(f"{test_case_name:72}")
                # This flush is needed so you can see the test name of the long
                # running test before it will finish. But don't do it in parallel
                # mode, so that the lines don't mix.
                sys.stdout.flush()

            while True:
                # This is the upper level timeout
                # It helps with completely frozen processes, like in case of gdb errors
                def timeout_handler(_signum, _frame):
                    stop_tests()
                    raise TimeoutError("Test execution timed out")

                signal.signal(signal.SIGALRM, timeout_handler)
                signal.alarm(int(args.timeout * 1.1))
                test_result = None
                try:
                    test_result = test_case.run(
                        args, test_suite, client_options, server_logs_level
                    )
                    test_result = test_case.process_result(test_result, MESSAGES)
                except TimeoutError:
                    break
                finally:
                    signal.alarm(0)

                if not test_result or not test_result.need_retry:
                    break
                restarted_tests.append(test_result)

            # First print the description, than invoke the check result logic
            description += test_result.description

            if description and not description.endswith("\n"):
                description += "\n"

            sys.stdout.write(description)
            sys.stdout.flush()

            if test_result.status == TestStatus.OK:
                passed_total += 1
                failures_chain = 0
            elif test_result.status == TestStatus.FAIL:
                failures_total += 1
                failures_chain += 1
                if test_result.reason == FailureReason.SERVER_DIED:
                    stop_tests()
                    server_died.set()
                    raise ServerDied("Server died")
            elif test_result.status == TestStatus.SKIPPED:
                skipped_total += 1

        except KeyboardInterrupt as e:
            print(colored("Break tests execution", args, "red"))
            stop_tests()
            raise e

        if failures_chain >= args.max_failures_chain:
            stop_tests()
            raise ServerDied("Max failures chain")

    if failures_total > 0:
        print(
            colored(
                f"\nHaving {failures_total} errors! {passed_total} tests passed."
                f" {skipped_total} tests skipped."
                f" {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
                f" ({multiprocessing.current_process().name}).",
                args,
                "red",
                attrs=["bold"],
            )
        )
        exit_code.value = 1
    else:
        print(
            colored(
                f"\n{passed_total} tests passed. {skipped_total} tests skipped."
                f" {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
                f" ({multiprocessing.current_process().name}).",
                args,
                "green",
                attrs=["bold"],
            )
        )

    sys.stdout.flush()


server_logs_level = "warning"


def check_server_started(args):
    print("Connecting to ClickHouse server...", end="")

    sys.stdout.flush()
    retry_count = args.server_check_retries
    query = "SELECT version(), arrayStringConcat(groupArray(value), ' ') FROM system.build_options WHERE name IN ('GIT_HASH', 'GIT_BRANCH')"
    while retry_count > 0:
        try:
            res = (
                str(clickhouse_execute(args, query).decode())
                .strip()
                .replace("\t", " @ ")
            )
            print(" OK")
            print(f"Connected to server {res}")
            sys.stdout.flush()
            return True
        except (ConnectionError, http.client.ImproperConnectionState) as e:
            if args.hung_check:
                print("Connection error, will retry: ", str(e))
            else:
                print(".", end="")
            sys.stdout.flush()
            retry_count -= 1
            sleep(0.5)
            continue
        except TimeoutError:
            print("\nConnection timeout, will not retry")
            break
        except Exception as e:
            print(
                "\nUexpected exception, will not retry: ",
                type(e).__name__,
                ": ",
                str(e),
            )
            break

    print("\nAll connection tries failed")
    sys.stdout.flush()
    return False


class BuildFlags:
    THREAD = "tsan"
    ADDRESS = "asan"
    UNDEFINED = "ubsan"
    MEMORY = "msan"
    DEBUG = "debug"
    SANITIZE_COVERAGE = "sanitize-coverage"
    RELEASE = "release"
    ORDINARY_DATABASE = "ordinary-database"
    POLYMORPHIC_PARTS = "polymorphic-parts"


# Release and non-sanitizer build
RELEASE_NON_SANITIZED = False


def collect_build_flags(args):
    global RELEASE_NON_SANITIZED

    result = []

    value = clickhouse_execute(
        args, "SELECT value FROM system.build_options WHERE name = 'CXX_FLAGS'"
    )
    if b"-fsanitize=thread" in value:
        result.append(BuildFlags.THREAD)
    elif b"-fsanitize=address" in value:
        result.append(BuildFlags.ADDRESS)
    elif b"-fsanitize=undefined" in value:
        result.append(BuildFlags.UNDEFINED)
    elif b"-fsanitize=memory" in value:
        result.append(BuildFlags.MEMORY)
    elif b"-DSANITIZE_COVERAGE=1" in value:
        result.append(BuildFlags.SANITIZE_COVERAGE)

    value = clickhouse_execute(
        args, "SELECT value FROM system.build_options WHERE name = 'BUILD_TYPE'"
    )
    if b"Debug" in value:
        result.append(BuildFlags.DEBUG)
    elif b"RelWithDebInfo" in value or b"Release" in value:
        result.append(BuildFlags.RELEASE)

    RELEASE_NON_SANITIZED = result == [BuildFlags.RELEASE]

    value = clickhouse_execute(
        args,
        "SELECT value FROM system.settings WHERE name = 'allow_deprecated_database_ordinary'",
    )
    if value == b"1" or args.db_engine == "Ordinary":
        result.append(BuildFlags.ORDINARY_DATABASE)

    value = int(
        clickhouse_execute(
            args,
            "SELECT value FROM system.merge_tree_settings WHERE name = 'min_bytes_for_wide_part'",
        )
    )
    if value == 0:
        result.append(BuildFlags.POLYMORPHIC_PARTS)

    use_flags = clickhouse_execute(
        args,
        "SELECT name FROM system.build_options WHERE name like 'USE_%' AND value in ('ON', '1')",
    )
    for use_flag in use_flags.strip().splitlines():
        use_flag = use_flag.decode().lower()
        result.append(use_flag)

    system_processor = clickhouse_execute(
        args,
        "SELECT value FROM system.build_options WHERE name = 'SYSTEM_PROCESSOR' LIMIT 1",
    ).strip()
    if system_processor:
        result.append(f"cpu-{system_processor.decode().lower()}")

    return result


def collect_changed_merge_tree_settings(args):
    changed_settings = (
        clickhouse_execute(
            args,
            "SELECT name FROM system.merge_tree_settings WHERE changed",
        )
        .strip()
        .splitlines()
    )

    return list(map(lambda s: s.decode(), changed_settings))


def check_table_column(args, database, table, column):
    return (
        int(
            clickhouse_execute(
                args,
                f"""
    SELECT count()
    FROM system.columns
    WHERE database = '{database}' AND table = '{table}' AND name = '{column}'
    """,
            )
        )
        > 0
    )


def suite_key_func(item: str) -> Union[float, Tuple[int, str]]:
    if args.order == "random":
        return random.random()

    if -1 == item.find("_"):
        return 99998, ""

    prefix, suffix = item.split("_", 1)

    try:
        return int(prefix), suffix
    except ValueError:
        return 99997, ""


def extract_key(key: str) -> str:
    return subprocess.getstatusoutput(
        args.extract_from_config + " --try --config " + args.configserver + key
    )[1]


def run_tests_process(*args, **kwargs):
    return run_tests_array(*args, **kwargs)


def do_run_tests(jobs, test_suite: TestSuite):
    if jobs > 1 and len(test_suite.parallel_tests) > 0:
        print(
            "Found",
            len(test_suite.parallel_tests),
            "parallel tests and",
            len(test_suite.sequential_tests),
            "sequential tests",
        )
        tests_n = len(test_suite.parallel_tests)
        jobs = min(jobs, tests_n)

        # If we don't do random shuffling then there will be always
        # nearly the same groups of test suites running concurrently.
        # Thus, if there is a test within group which appears to be broken
        # then it will affect all other tests in a non-random form.
        # So each time a bad test fails - other tests from the group will also fail
        # and this process will be more or less stable.
        # It makes it more difficult to detect real flaky tests,
        # because the distribution and the amount
        # of failures will be nearly the same for all tests from the group.
        random.shuffle(test_suite.parallel_tests)

        batch_size = len(test_suite.parallel_tests) // jobs
        manager = multiprocessing.Manager()
        parallel_tests = manager.list()
        parallel_tests.extend(test_suite.parallel_tests)

        processes = []
        for _ in range(jobs):
            process = multiprocessing.Process(
                target=run_tests_process,
                args=((parallel_tests, batch_size, test_suite, True),),
            )
            processes.append(process)
            process.start()

        while processes:
            sys.stdout.flush()
            # Periodically check the server for hangs
            # and stop all processes in this case
            try:
                clickhouse_execute(
                    args,
                    query="SELECT 1 /*hung check*/",
                    max_http_retries=20,
                    timeout=10,
                )
            except Exception as e:
                print(f"Hung check failed: {str(e)}")
                server_died.set()

            if server_died.is_set():
                print("Server died, terminating all processes...")
                kill_gdb_if_any()
                # Wait for test results
                sleep(args.timeout)
                for p in processes:
                    if p.is_alive():
                        p.terminate()
                break

            for p in processes[:]:
                if not p.is_alive():
                    processes.remove(p)

        run_tests_array(
            (
                test_suite.sequential_tests,
                len(test_suite.sequential_tests),
                test_suite,
                False,
            )
        )

        return len(test_suite.sequential_tests) + len(test_suite.parallel_tests)
    num_tests = len(test_suite.all_tests)
    run_tests_array(
        (
            test_suite.all_tests,
            num_tests,
            test_suite,
            False,
        )
    )
    return num_tests


def is_test_from_dir(suite_dir, case):
    case_file = os.path.join(suite_dir, case)
    # We could also test for executable files (os.access(case_file, os.X_OK),
    # but it interferes with 01610_client_spawn_editor.editor, which is invoked
    # as a query editor in the test, and must be marked as executable.
    return os.path.isfile(case_file) and any(
        case_file.endswith(suppotred_ext) for suppotred_ext in TEST_FILE_EXTENSIONS
    )


def removesuffix(text, *suffixes):
    """
    Added in python 3.9
    https://www.python.org/dev/peps/pep-0616/

    This version can work with several possible suffixes
    """
    for suffix in suffixes:
        if suffix and text.endswith(suffix):
            return text[: -len(suffix)]
    return text


def reportCoverageFor(args, what, query, permissive=False):
    value = clickhouse_execute(args, query).decode()

    if value != "":
        print(f"\nThe following {what} were not covered by tests:\n")
        print(value)
        print("\n")
        return permissive

    return True


# This is high-level coverage on per-component basis (functions, data types, etc.)
# Don't be confused with the code coverage.
def reportCoverage(args):
    clickhouse_execute(args, "SYSTEM FLUSH LOGS")

    return (
        reportCoverageFor(
            args,
            "functions",
            """
            SELECT name
            FROM system.functions
            WHERE NOT is_aggregate AND origin = 'System' AND alias_to = ''
                AND name NOT IN
                (
                    SELECT arrayJoin(used_functions) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
            True,
        )
        and reportCoverageFor(
            args,
            "aggregate functions",
            """
            SELECT name
            FROM system.functions
            WHERE is_aggregate AND origin = 'System' AND alias_to = ''
                AND name NOT IN
                (
                    SELECT arrayJoin(used_aggregate_functions) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
        and reportCoverageFor(
            args,
            "aggregate function combinators",
            """
            SELECT name
            FROM system.aggregate_function_combinators
            WHERE NOT is_internal
                AND name NOT IN
                (
                    SELECT arrayJoin(used_aggregate_function_combinators) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
        and reportCoverageFor(
            args,
            "data type families",
            """
            SELECT name
            FROM system.data_type_families
            WHERE alias_to = '' AND name NOT LIKE 'Interval%'
                AND name NOT IN
                (
                    SELECT arrayJoin(used_data_type_families) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
    )


def reportLogStats(args):
    clickhouse_execute(args, "SYSTEM FLUSH LOGS")

    query = """
        WITH
            240 AS mins,
            (
                SELECT (count(), sum(length(toValidUTF8(message))))
                FROM system.text_log
                WHERE (now() - toIntervalMinute(mins)) < event_time
            ) AS total
        SELECT
            count() AS count,
            round(count / (total.1), 3) AS `count_%`,
            formatReadableSize(sum(length(toValidUTF8(message)))) AS size,
            round(sum(length(toValidUTF8(message))) / (total.2), 3) AS `size_%`,
            countDistinct(logger_name) AS uniq_loggers,
            countDistinct(thread_id) AS uniq_threads,
            groupArrayDistinct(toString(level)) AS levels,
            round(sum(query_id = '') / count, 3) AS `background_%`,
            message_format_string
        FROM system.text_log
        WHERE (now() - toIntervalMinute(mins)) < event_time
        GROUP BY message_format_string
        ORDER BY count DESC
        LIMIT 100
        FORMAT PrettySpaceNoEscapes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop patterns of log messages:\n")
    print(value)
    print("\n")

    query = """
        WITH
            240 AS mins
        SELECT
            count() AS count,
            substr(replaceRegexpAll(toValidUTF8(message), '[^A-Za-z]+', ''), 1, 32) AS pattern,
            substr(any(toValidUTF8(message)), 1, 256) as runtime_message,
            any((extract(source_file, '/[a-zA-Z0-9_]+\\.[a-z]+'), source_line)) as line
        FROM system.text_log
        WHERE (now() - toIntervalMinute(mins)) < event_time AND message_format_string = ''
        GROUP BY pattern
        ORDER BY count DESC
        LIMIT 30
        FORMAT PrettySpaceNoEscapes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages without format string (fmt::runtime):\n")
    print(value)
    print("\n")

    query = """
        SELECT message_format_string, count(), any(toValidUTF8(message)) AS any_message
        FROM system.text_log
        WHERE (now() - toIntervalMinute(240)) < event_time
        AND (message NOT LIKE (replaceRegexpAll(message_format_string, '{[:.0-9dfx]*}', '%') AS s))
        AND (message NOT LIKE concat('%Exception: ', s, '%'))
        GROUP BY message_format_string ORDER BY count() DESC LIMIT 20 FORMAT PrettySpaceNoEscapes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages not matching their format strings:\n")
    print(value)
    print("\n")

    query = """
        WITH ('', '({}) Keys: {}', '({}) {}', 'Aggregating', 'Became leader', 'Cleaning queue',
              'Creating set.', 'Cyclic aliases', 'Detaching {}', 'Executing {}', 'Fire events: {}',
              'Found part {}', 'Loaded queue', 'No sharding key', 'No tables', 'Query: {}',
              'Removed', 'Removed part {}', 'Removing parts.', 'Request URI: {}', 'Sending part {}',
              'Sent handshake', 'Starting {}', 'Will mimic {}', 'Writing to {}', 'dropIfEmpty',
              'loadAll {}', '{} ({}:{})', '{} -> {}', '{} {}', '{}: {}', '{}%', 'Read object: {}',
              'New segment: {}', 'Convert overflow', 'Division by zero', 'Files set to {}',
              'Bytes set to {}', 'Numeric overflow', 'Invalid mode: {}',
              'Write file: {}', 'Unable to parse JSONPath', 'Host is empty in S3 URI.', 'Expected end of line',
              'inflate failed: {}{}', 'Center is not valid', 'Column ''{}'' is ambiguous', 'Cannot parse object', 'Invalid date: {}',
              'There is no cache by name: {}', 'No part {} in table', '`{}` should be a String', 'There are duplicate id {}',
              'Invalid replica name: {}', 'Unexpected value {} in enum', 'Unknown BSON type: {}', 'Point is not valid',
              'Invalid qualified name: {}', 'INTO OUTFILE is not allowed', 'Arguments must not be NaN', 'Cell is not valid',
              'brotli decode error{}', 'Invalid H3 index: {}', 'Too large node state size', 'No additional keys found.',
              'Attempt to read after EOF.', 'Replication was stopped', '{}	building file infos', 'Cannot parse uuid {}',
              'Query was cancelled', 'Cancelled merging parts', 'Cancelled mutating parts', 'Log pulling is cancelled',
              'Transaction was cancelled', 'Could not find table: {}', 'Table {} doesn''t exist',
              'Database {} doesn''t exist', 'Dictionary ({}) not found', 'Unknown table function {}',
              'Unknown format {}', 'Unknown explain kind ''{}''', 'Unknown setting {}', 'Unknown input format {}',
              'Unknown identifier: ''{}''', 'User name is empty', 'Expected function, got: {}',
              'Attempt to read after eof', 'String size is too big ({}), maximum: {}'
        ) AS known_short_messages
        SELECT count() AS c, message_format_string, substr(any(toValidUTF8(message)), 1, 120),
            min(if(length(regexpExtract(toValidUTF8(message), '(.*)\\([A-Z0-9_]+\\)')) as prefix_len > 0, prefix_len, length(toValidUTF8(message))) - 26 AS length_without_exception_boilerplate) AS min_length_without_exception_boilerplate
        FROM system.text_log
        WHERE (now() - toIntervalMinute(240)) < event_time
            AND (length(message_format_string) < 16
                OR (message ILIKE '%DB::Exception%' AND length_without_exception_boilerplate < 30))
            AND message_format_string NOT IN known_short_messages
        GROUP BY message_format_string ORDER BY c DESC LIMIT 50 FORMAT PrettySpaceNoEscapes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop short messages:\n")
    print(value)
    print("\n")

    query = """
        SELECT max((freq, message_format_string)), level
        FROM (SELECT count() / (SELECT count() FROM system.text_log
              WHERE (now() - toIntervalMinute(240)) < event_time) AS freq,
              min(level) AS level, message_format_string FROM system.text_log
              WHERE (now() - toIntervalMinute(120)) < event_time
              GROUP BY message_format_string ORDER BY freq DESC)
        GROUP BY level
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages by level:\n")
    print(value)
    print("\n")


def try_get_skip_list(base_dir, name):
    test_names_to_skip = []
    skip_list_path = os.path.join(base_dir, name)
    if not os.path.exists(skip_list_path):
        return test_names_to_skip

    with open(skip_list_path, "r", encoding="utf-8") as fd:
        for line in fd.read().split("\n"):
            if line == "" or line[0] == " ":
                continue
            test_name = line.split()[0].strip()
            if test_name != "":
                test_names_to_skip.append(test_name)

    return test_names_to_skip


def main(args):
    global server_died
    global stop_time
    global exit_code
    global server_logs_level
    global restarted_tests

    if not check_server_started(args):
        msg = "Server is not responding. Cannot execute 'SELECT 1' query."
        if args.hung_check:
            print(msg)
            pid = get_server_pid()
            print("Got server pid", pid)
            print_stacktraces()
        raise TestException(msg)

    args.build_flags = collect_build_flags(args)
    args.changed_merge_tree_settings = collect_changed_merge_tree_settings(args)

    if args.s3_storage and (BuildFlags.RELEASE not in args.build_flags):
        args.no_random_settings = True

    if args.skip:
        args.skip = set(args.skip)

    if args.replace_replicated_with_shared:
        if not args.skip:
            args.skip = set([])
        args.skip = set(args.skip)

    base_dir = os.path.abspath(args.queries)

    # Keep same default values as in queries/shell_config.sh
    os.environ.setdefault("CLICKHOUSE_BINARY", args.binary)
    # os.environ.setdefault("CLICKHOUSE_CLIENT", args.client)
    os.environ.setdefault("CLICKHOUSE_CONFIG", args.configserver)

    if args.configclient:
        os.environ.setdefault("CLICKHOUSE_CONFIG_CLIENT", args.configclient)

    # Force to print server warnings in stderr
    # Shell scripts could change logging level
    os.environ.setdefault("CLICKHOUSE_CLIENT_SERVER_LOGS_LEVEL", server_logs_level)

    # This code is bad as the time is not monotonic
    if args.global_time_limit:
        stop_time = time() + args.global_time_limit

    if args.zookeeper is None:
        args.zookeeper = True

    if args.shard is None:
        args.shard = bool(extract_key(' --key listen_host | grep -E "127.0.0.2|::"'))

    def create_common_database(args, db_name):
        create_database_retries = 0
        while create_database_retries < MAX_RETRIES:
            start_time = datetime.now()
            try:
                clickhouse_execute(
                    args,
                    f"CREATE DATABASE IF NOT EXISTS {db_name} "
                    f"{get_db_engine(args, db_name)}",
                    settings=get_create_database_settings(args, None),
                )
                break
            except HTTPError as e:
                total_time = (datetime.now() - start_time).total_seconds()
                if not need_retry(args, e.message, e.message, total_time):
                    break
            create_database_retries += 1

    try:
        if args.database and args.database != "test":
            create_common_database(args, args.database)

        create_common_database(args, "test")
    except Exception as e:
        print(f"Failed to create databases for tests: {e}")
        server_died.set()

    if (
        args.collect_per_test_coverage
        and BuildFlags.SANITIZE_COVERAGE in args.build_flags
    ):
        clickhouse_execute(
            args,
            """
                CREATE TABLE IF NOT EXISTS system.coverage_log
                (
                    time DateTime,
                    test_name String,
                    coverage Array(UInt64)
                ) ENGINE = MergeTree ORDER BY test_name
                COMMENT 'Contains information about per-test coverage from the CI, but used only for exporting to the CI cluster';
            """,
        )

        # Coverage collected at the system startup before running any tests:
        clickhouse_execute(
            args,
            "INSERT INTO system.coverage_log SELECT now(), '', coverageCurrent()",
        )

    total_tests_run = 0
    cloud_skip_list = try_get_skip_list(base_dir, "../queries-no-cloud-tests.txt")
    private_skip_list = try_get_skip_list(base_dir, "../queries-no-private-tests.txt")

    for suite in sorted(os.listdir(base_dir), key=suite_key_func):
        if server_died.is_set():
            break

        test_suite = TestSuite.read_test_suite(args, suite)
        if test_suite is None:
            continue

        test_suite.cloud_skip_list = cloud_skip_list
        test_suite.private_skip_list = private_skip_list
        total_tests_run += do_run_tests(args.jobs, test_suite)

    if server_died.is_set():
        exit_code.value = 1

    if args.hung_check:
        # Some queries may execute in background for some time after test was finished. This is normal.
        print("Checking the hung queries: ", end="")
        hung_count = 0
        try:
            deadline = datetime.now() + timedelta(seconds=90)
            while datetime.now() < deadline:
                hung_count = get_processlist_size(args)
                if hung_count == 0:
                    print(" done")
                    break
                print(". ", end="")
        except Exception as e:
            print(
                colored(
                    "\nHung check failed. Failed to get processlist size: " + str(e),
                    args,
                    "red",
                    attrs=["bold"],
                )
            )
            exit_code.value = 1

        processlist = ""
        if hung_count > 0:
            try:
                processlist = get_processlist_with_stacktraces(args)
            except Exception as e:
                print(
                    colored(
                        "\nHung check failed. Failed to get processlist with stacktraces: "
                        + str(e),
                        args,
                        "red",
                        attrs=["bold"],
                    )
                )
                exit_code.value = 1

        if processlist:
            print(
                colored(
                    "\nFound hung queries in processlist:", args, "red", attrs=["bold"]
                )
            )
            print(processlist.decode())
            print(get_transactions_list(args))

            print_stacktraces()
            exit_code.value = 1
        else:
            print(colored("\nNo queries hung.", args, "green", attrs=["bold"]))

    if args.client_log:
        for log_file in [args.client_log, *glob.glob(f"{args.client_log}.*")]:
            if not os.path.exists(log_file):
                continue
            with open(log_file, "rb") as stream:
                content = stream.read().decode()
                if len(content):
                    print(f"Has fatal logs from client in '{log_file}':\n")
                    print(content)
            os.remove(log_file)

    if len(restarted_tests) > 0:
        print("\nSome tests were restarted:\n")

        for test_result in restarted_tests:
            print(f"\n{test_result.case_name:72}: ")
            # replace it with lowercase to avoid parsing retried tests as failed
            for status in TestStatus:
                test_result.description = test_result.description.replace(
                    status.value, status.value.lower()
                )
            print(test_result.description)

    if total_tests_run == 0:
        print("No tests were run.")
        sys.exit(1)
    else:
        print("All tests have finished.")

    if args.report_logs_stats:
        try:
            reportLogStats(args)
        except Exception as e:
            print(f"Failed to get stats about log messages: {e}")

    if args.report_coverage and not reportCoverage(args):
        exit_code.value = 1

    sys.exit(exit_code.value)


def find_binary(name):
    if os.access(name, os.X_OK):
        return name
    paths = os.environ.get("PATH").split(":")
    for path in paths:
        bin_path = os.path.join(path, name)
        if os.access(bin_path, os.X_OK):
            return bin_path

    # maybe it wasn't in PATH
    bin_path = os.path.join("/usr/local/bin", name)
    if os.access(bin_path, os.X_OK):
        return bin_path
    bin_path = os.path.join("/usr/bin", name)
    if os.access(bin_path, os.X_OK):
        return bin_path

    raise TestException(f"{name} was not found in PATH")


def find_clickhouse_command(binary, command):
    symlink = binary + "-" + command
    if os.access(symlink, os.X_OK):
        return symlink

    # To avoid requiring symlinks (in case you download binary from CI)
    return binary + " " + command


def get_additional_client_options(args):
    if args.client_option:
        client_options = " ".join("--" + option for option in args.client_option)
        if "CLICKHOUSE_CLIENT_OPT" in os.environ:
            return os.environ["CLICKHOUSE_CLIENT_OPT"] + " " + client_options
        return client_options
    if "CLICKHOUSE_CLIENT_OPT" in os.environ:
        return os.environ["CLICKHOUSE_CLIENT_OPT"]
    return ""


def get_additional_client_options_url(args):
    if args.client_option:
        return "&".join(args.client_option)
    return ""


def parse_args():
    parser = ArgumentParser(description="ClickHouse functional tests")
    parser.add_argument("-q", "--queries", help="Path to queries dir")
    parser.add_argument("--tmp", help="Path to tmp dir")

    parser.add_argument(
        "-b",
        "--binary",
        default="clickhouse",
        type=find_binary,
        help="Path to clickhouse binary or name of binary in PATH",
    )
    parser.add_argument(
        "-c",
        "--client",
        help="Path to clickhouse-client, this option is useless"
        "name of binary in PATH",
    )

    parser.add_argument("--extract_from_config", help="extract-from-config program")
    parser.add_argument(
        "--configclient", help="Client config (if you do not use default ports)"
    )
    parser.add_argument(
        "--configserver",
        default="/etc/clickhouse-server/config.xml",
        help="Preprocessed server config",
    )
    parser.add_argument(
        "-o", "--output", help="Output xUnit compliant test report directory"
    )
    parser.add_argument(
        "-t",
        "--timeout",
        type=int,
        default=600,
        help="Timeout for each test case in seconds",
    )
    parser.add_argument(
        "--global_time_limit",
        type=int,
        help="Stop if executing more than specified time (after current test is finished)",
    )
    parser.add_argument("test", nargs="*", help="Optional test case name regex")
    parser.add_argument(
        "-d",
        "--disabled",
        action="store_true",
        default=False,
        help="Also run disabled tests",
    )
    parser.add_argument(
        "--stop",
        action="store_true",
        default=None,
        dest="stop",
        help="Stop on network errors",
    )
    parser.add_argument(
        "--order", default="desc", choices=["asc", "desc", "random"], help="Run order"
    )
    parser.add_argument(
        "--testname",
        action="store_true",
        default=None,
        dest="testname",
        help="Make query with test name before test run",
    )
    parser.add_argument("--hung-check", action="store_true", default=False)
    parser.add_argument("--no-left-queries-check", action="store_true", default=False)
    parser.add_argument("--force-color", action="store_true", default=False)
    parser.add_argument(
        "--database", help="Database for tests (random name test_XXXXXX by default)"
    )
    parser.add_argument(
        "--no-drop-if-fail",
        action="store_true",
        help="Do not drop database for test if test has failed",
    )
    parser.add_argument(
        "--hide-db-name",
        action="store_true",
        help='Replace random database name with "default" in stderr',
    )
    parser.add_argument(
        "--parallel", default="1/1", help="One parallel test run number/total"
    )
    parser.add_argument(
        "-j", "--jobs", default=1, nargs="?", type=int, help="Run all tests in parallel"
    )
    parser.add_argument(
        "--test-runs",
        default=1,
        nargs="?",
        type=int,
        help="Run each test many times (useful for e.g. flaky check)",
    )
    parser.add_argument(
        "-U",
        "--unified",
        default=3,
        type=int,
        help="output NUM lines of unified context",
    )
    parser.add_argument(
        "-r",
        "--server-check-retries",
        default=180,
        type=int,
        help="Num of tries to execute SELECT 1 before tests started",
    )
    parser.add_argument("--db-engine", help="Database engine name")
    parser.add_argument(
        "--replicated-database",
        action="store_true",
        default=False,
        help="Run tests with Replicated database engine",
    )
    parser.add_argument(
        "--fast-tests-only",
        action="store_true",
        default=False,
        help='Run only fast tests (the tests without the "no-fasttest" tag)',
    )
    parser.add_argument(
        "--no-stateless", action="store_true", help="Disable all stateless tests"
    )
    parser.add_argument(
        "--no-stateful", action="store_true", help="Disable all stateful tests"
    )
    parser.add_argument("--skip", nargs="+", help="Skip these tests")
    parser.add_argument(
        "--sequential",
        nargs="+",
        help="Run these tests sequentially even if --parallel specified",
    )
    parser.add_argument(
        "--no-long", action="store_true", dest="no_long", help="Do not run long tests"
    )
    parser.add_argument(
        "--client-option", nargs="+", help="Specify additional client argument"
    )
    parser.add_argument(
        "--print-time", action="store_true", dest="print_time", help="Print test time"
    )
    parser.add_argument(
        "--check-zookeeper-session",
        action="store_true",
        help="Check ZooKeeper session uptime to determine if failed test should be retried",
    )
    parser.add_argument(
        "--s3-storage",
        action="store_true",
        default=False,
        help="Run tests over s3 storage",
    )
    parser.add_argument(
        "--distributed-cache",
        action="store_true",
        default=False,
        help="Run tests with enabled distributed cache",
    )
    parser.add_argument(
        "--azure-blob-storage",
        action="store_true",
        default=False,
        help="Run tests over azure blob storage",
    )
    parser.add_argument(
        "--no-random-settings",
        action="store_true",
        default=False,
        help="Disable settings randomization",
    )
    parser.add_argument(
        "--no-random-merge-tree-settings",
        action="store_true",
        default=False,
        help="Disable MergeTree settings randomization",
    )
    parser.add_argument(
        "--run-by-hash-num",
        type=int,
        help="Run tests matching crc32(test_name) % run_by_hash_total == run_by_hash_num",
    )
    parser.add_argument(
        "--run-by-hash-total",
        type=int,
        help="Total test groups for crc32(test_name) % run_by_hash_total == run_by_hash_num",
    )

    parser.add_argument(
        "--show-whitespaces-in-diff",
        action="store_true",
        help="Display $ characters after line with trailing whitespaces in diff output",
    )

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--cloud",
        action="store_true",
        default=None,
        dest="cloud",
        help="Run only tests that are supported in ClickHouse Cloud environment",
    )

    group.add_argument(
        "--no-cloud",
        action="store_false",
        default=None,
        dest="cloud",
        help="Run all the tests, including the ones not supported in ClickHouse Cloud environment",
    )
    parser.set_defaults(cloud=False)

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--private",
        action="store_true",
        default=None,
        dest="private",
        help="Run only tests that are supported in the private build",
    )

    group.add_argument(
        "--no-private",
        action="store_false",
        default=None,
        dest="private",
        help="Run all the tests, including the ones not supported in the private build",
    )
    # Only used to skip tests via "../queries-no-private-tests.txt", so it's fine to keep it enabled by default
    parser.set_defaults(private=True)

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--zookeeper",
        action="store_true",
        default=None,
        dest="zookeeper",
        help="Run zookeeper related tests",
    )
    group.add_argument(
        "--no-zookeeper",
        action="store_false",
        default=None,
        dest="zookeeper",
        help="Do not run zookeeper related tests",
    )

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--shard",
        action="store_true",
        default=None,
        dest="shard",
        help="Run sharding related tests "
        "(required to clickhouse-server listen 127.0.0.2 127.0.0.3)",
    )
    group.add_argument(
        "--no-shard",
        action="store_false",
        default=None,
        dest="shard",
        help="Do not run shard related tests",
    )

    # TODO: Remove upgrade-check option after release 24.3 and use
    #       ignore_drop_queries_probability option in stress.py as in stress tests
    group.add_argument(
        "--upgrade-check",
        action="store_true",
        help="Run tests for further server upgrade testing by ignoring all"
        "drop queries in tests for collecting data from new version of server",
    )
    parser.add_argument(
        "--secure",
        action="store_true",
        default=False,
        help="Use secure connection to connect to clickhouse-server",
    )
    parser.add_argument(
        "--max-failures-chain",
        default=20,
        type=int,
        help="Max number of failed tests in a row (stop tests if higher)",
    )
    parser.add_argument(
        "--report-coverage",
        action="store_true",
        default=False,
        help="Check what high-level server components were covered by tests",
    )
    parser.add_argument(
        "--collect-per-test-coverage",
        action="store_true",
        default=True,
        help="Create `system.coverage_log` table on the server and collect information about low-level code coverage on a per test basis there",
    )
    parser.add_argument(
        "--reset-coverage-before-every-test",
        action="store_true",
        default=True,
        help="Collect isolated test coverage for every test instead of a cumulative. Useful only when tests are run sequentially.",
    )
    parser.add_argument(
        "--report-logs-stats",
        action="store_true",
        default=False,
        help="Report statistics about log messages",
    )
    parser.add_argument(
        "--no-parallel-replicas",
        action="store_true",
        default=False,
        help="Do not include tests that are not supported with parallel replicas feature",
    )
    parser.add_argument(
        "--replace-replicated-with-shared",
        action="store_true",
        default=os.environ.get("REPLACE_RMT_WITH_SMT", False),
        help="Replace ReplicatedMergeTree engine with SharedMergeTree",
    )
    parser.add_argument(
        "--replace-non-replicated-with-shared",
        action="store_true",
        default=os.environ.get("REPLACE_MT_WITH_SMT", False),
        help="Replace ordinary MergeTree engine with SharedMergeTree",
    )
    parser.add_argument(
        "--client-log",
        default="./client.fatal.log",
        help="Path to file for fatal logs from client",
    )
    parser.add_argument(
        "--capture-client-stacktrace",
        action="store_true",
        help="Capture stacktraces from clickhouse-client/local on errors",
    )

    return parser.parse_args()


class Terminated(KeyboardInterrupt):
    def __init__(self, signal):
        self.signal = signal


def signal_handler(signal, frame):
    raise Terminated(signal)


if __name__ == "__main__":
    # Move to a new process group and kill it at exit so that we don't have any
    # infinite tests processes left
    # (new process group is required to avoid killing some parent processes)
    os.setpgid(0, 0)

    stop_time = None
    exit_code = multiprocessing.Value("i", 0)
    server_died = multiprocessing.Event()
    multiprocessing_manager = multiprocessing.Manager()
    restarted_tests = multiprocessing_manager.list()

    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGHUP, signal_handler)

    try:
        args = parse_args()
    except Exception as e:
        print(e, file=sys.stderr)
        sys.exit(1)

    if args.queries and not os.path.isdir(args.queries):
        print(
            f"Cannot access the specified directory with queries ({args.queries})",
            file=sys.stderr,
        )
        assert False, "No --queries provided"

    CAPTURE_CLIENT_STACKTRACE = args.capture_client_stacktrace

    # Autodetect the directory with queries if not specified
    if args.queries is None:
        args.queries = "queries"

    if not os.path.isdir(args.queries):
        # If we're running from the repo
        args.queries = os.path.join(
            os.path.dirname(os.path.abspath(__file__)), "queries"
        )

    if not os.path.isdir(args.queries):
        # Next we're going to try some system directories, don't write 'stdout' files into them.
        if args.tmp is None:
            args.tmp = "/tmp/clickhouse-test"

        args.queries = "/usr/local/share/clickhouse-test/queries"

    if not os.path.isdir(args.queries):
        args.queries = "/usr/share/clickhouse-test/queries"

    if not os.path.isdir(args.queries):
        print(
            "Failed to detect path to the queries directory. Please specify it with "
            "'--queries' option.",
            file=sys.stderr,
        )
        sys.exit(1)

    print("Using queries from '" + args.queries + "' directory")

    if args.tmp is None:
        args.tmp = args.queries

    if args.client:
        print(
            "WARNING: --client option is deprecated and will be removed the the future, use --binary instead",
            file=sys.stderr,
        )

    args.client = find_clickhouse_command(args.binary, "client")

    if args.extract_from_config:
        print(
            "WARNING: --extract_from_config option is deprecated and will be removed the the future",
            file=sys.stderr,
        )
    args.extract_from_config = find_clickhouse_command(
        args.binary, "extract-from-config"
    )

    if args.configclient:
        args.client += " --config-file=" + args.configclient

    tcp_host = os.getenv("CLICKHOUSE_HOST")
    if tcp_host is not None:
        args.tcp_host = tcp_host
        args.client += f" --host={tcp_host}"
    else:
        args.tcp_host = "localhost"

    tcp_port = os.getenv("CLICKHOUSE_PORT_TCP")
    if tcp_port is not None:
        args.tcp_port = int(tcp_port)
        args.client += f" --port={tcp_port}"
    else:
        args.tcp_port = 9440 if args.secure else 9000
        if args.secure:
            os.environ["CLICKHOUSE_PORT_TCP"] = str(args.tcp_port)

    http_port = os.getenv("CLICKHOUSE_PORT_HTTP")
    if http_port is not None:
        args.http_port = int(http_port)
    else:
        args.http_port = 8443 if args.secure else 8123
        os.environ["CLICKHOUSE_PORT_HTTP"] = str(args.http_port)
        if args.secure and os.getenv("CLICKHOUSE_PORT_HTTP_PROTO") is None:
            os.environ["CLICKHOUSE_PORT_HTTP_PROTO"] = "https"

    client_database = os.getenv("CLICKHOUSE_DATABASE")
    if client_database is not None:
        args.client += f" --database={client_database}"
        args.client_database = client_database
    else:
        args.client_database = "default"

    if args.upgrade_check:
        args.client += " --fake-drop"

    if args.client_option or args.secure:
        # Set options for client
        if "CLICKHOUSE_CLIENT_OPT" in os.environ:
            os.environ["CLICKHOUSE_CLIENT_OPT"] += " "
        else:
            os.environ["CLICKHOUSE_CLIENT_OPT"] = ""
        os.environ["CLICKHOUSE_CLIENT_OPT"] += get_additional_client_options(args)

        if args.secure:
            os.environ["CLICKHOUSE_CLIENT_OPT"] += " --secure "

        # Set options for curl
        if "CLICKHOUSE_URL_PARAMS" in os.environ:
            os.environ["CLICKHOUSE_URL_PARAMS"] += "&"
        else:
            os.environ["CLICKHOUSE_URL_PARAMS"] = ""

        client_options_query_str = get_additional_client_options_url(args)
        args.client_options_query_str = client_options_query_str + "&"
        args.client_options_query_str += os.environ["CLICKHOUSE_URL_PARAMS"]
        os.environ["CLICKHOUSE_URL_PARAMS"] += client_options_query_str
    else:
        args.client_options_query_str = ""

    if args.jobs is None:
        args.jobs = multiprocessing.cpu_count()

    if args.db_engine and args.db_engine == "Ordinary":
        MESSAGES_TO_RETRY.append(" locking attempt on ")

    if args.replace_replicated_with_shared:
        args.s3_storage = True

    try:
        main(args)
    except ServerDied as e:
        print(f"{e}", file=sys.stderr)
        sys.exit(1)
    except Terminated as e:
        print(f"Terminated with {e.signal} signal", file=sys.stderr)
        sys.exit(128 + e.signal)
    except KeyboardInterrupt:
        print("Interrupted")
        sys.exit(128 + signal.SIGINT)