ClickHouse/tests/queries/0_stateless/02473_multistep_split_prewhere.python

#!/usr/bin/env python3
import requests
import os
import sys

CURDIR = os.path.dirname(os.path.realpath(__file__))
sys.path.insert(0, os.path.join(CURDIR, 'helpers'))

from pure_http_client import ClickHouseClient


class Tester:
    '''
    - Creates test table with multiple integer columns
    - Runs read queries with multiple range conditions on different columns in PREWHERE and check that the result is correct
    '''
    def __init__(self, session, url, index_granularity, total_rows):
        self.session = session
        self.url = url
        self.index_granularity = index_granularity
        self.total_rows = total_rows
        self.reported_errors = set()
        self.repro_queries = []

    def report_error(self):
        print('Repro steps:', '\n\n\t'.join(self.repro_queries))
        exit(1)

    def query(self, query_text, include_in_repro_steps = True, expected_data = None):
        self.repro_queries.append(query_text)
        resp = self.session.post(self.url, data=query_text)
        if resp.status_code != 200:
            # Group similar errors
            error = resp.text[0:40]
            if error not in self.reported_errors:
                self.reported_errors.add(error)
                print('Code:', resp.status_code)
                print('Result:', resp.text)
                self.report_error()

        result = resp.text
        # Check that the result is as expected
        if ((not expected_data is None) and (int(result) != len(expected_data))):
            print('Expected {} rows, got {}'.format(len(expected_data), result))
            print('Expected data:' + str(expected_data))
            self.report_error()

        if not include_in_repro_steps:
            self.repro_queries.pop()


    def check_data(self, all_data, c_range_start, c_range_end, d_range_start, d_range_end):
        for to_select in ['count()', 'sum(e)']: # Test reading with and without column with default value
            self.query('SELECT {} FROM tab_02473;'.format(to_select), False, all_data)

            delta = 10
            for b_range_start in [0, delta]:
                for b_range_end in [self.total_rows - delta]: #, self.total_rows]:
                    expected = all_data[
                        (all_data.a == 0) &
                        (all_data.b > b_range_start) &
                        (all_data.b <= b_range_end)]
                    self.query('SELECT {} from tab_02473 PREWHERE b > {} AND b <= {} WHERE a == 0;'.format(
                        to_select, b_range_start, b_range_end), False, expected)

                    expected = all_data[
                        (all_data.a == 0) &
                        (all_data.b > b_range_start) &
                        (all_data.b <= b_range_end) &
                        (all_data.c > c_range_start) &
                        (all_data.c <= c_range_end)]
                    self.query('SELECT {} from tab_02473 PREWHERE b > {} AND b <= {} AND c > {} AND c <= {} WHERE a == 0;'.format(
                        to_select, b_range_start, b_range_end, c_range_start, c_range_end), False, expected)

                    expected = all_data[
                        (all_data.a == 0) &
                        (all_data.b > b_range_start) &
                        (all_data.b <= b_range_end) &
                        (all_data.c > c_range_start) &
                        (all_data.c <= c_range_end) &
                        (all_data.d > d_range_start) &
                        (all_data.d <= d_range_end)]
                    self.query('SELECT {} from tab_02473 PREWHERE b > {} AND b <= {} AND c > {} AND c <= {} AND d > {} AND d <= {} WHERE a == 0;'.format(
                        to_select, b_range_start, b_range_end, c_range_start, c_range_end, d_range_start, d_range_end), False, expected)


    def run_test(self, c_range_start, c_range_end, d_range_start, d_range_end):
        self.repro_queries = []

        self.query('''
            CREATE TABLE tab_02473 (a Int8, b Int32, c Int32, d Int32, PRIMARY KEY (a))
            ENGINE = MergeTree() ORDER BY (a, b)
            SETTINGS min_bytes_for_wide_part = 0, index_granularity = {};'''.format(self.index_granularity))

        self.query('INSERT INTO tab_02473 select 0, number+1, number+1, number+1 FROM numbers({});'.format(self.total_rows))

        client = ClickHouseClient()
        all_data = client.query_return_df("SELECT a, b, c, d, 1 as e FROM tab_02473 FORMAT TabSeparatedWithNames;")

        self.query('OPTIMIZE TABLE tab_02473 FINAL SETTINGS mutations_sync=2;')

        # After all data has been written add a column with default value
        self.query('ALTER TABLE tab_02473 ADD COLUMN e Int64 DEFAULT 1;')

        self.check_data(all_data, c_range_start, c_range_end, d_range_start, d_range_end)

        self.query('DROP TABLE tab_02473;')



def main():
    # Enable multiple prewhere read steps
    url = os.environ['CLICKHOUSE_URL'] + '&enable_multiple_prewhere_read_steps=1&move_all_conditions_to_prewhere=0&max_threads=1'

    default_index_granularity = 10;
    total_rows = 8 * default_index_granularity
    step = default_index_granularity
    session = requests.Session()
    for index_granularity in [default_index_granularity-1, default_index_granularity]:
        tester = Tester(session, url, index_granularity, total_rows)
        # Test combinations of ranges of columns c and d
        for c_range_start in range(0, total_rows, int(2.3 * step)):
            for c_range_end in range(c_range_start + 3 * step, total_rows, int(2.1 * step)):
                for d_range_start in range(int(0.5 * step), total_rows, int(2.7 * step)):
                    for d_range_end in range(d_range_start + 3 * step, total_rows, int(2.2 * step)):
                        tester.run_test(c_range_start, c_range_end, d_range_start, d_range_end)


if __name__ == "__main__":
    main()