ClickHouse/tests/integration/test_dictionaries_null_value/test.py

import pytest
from helpers.cluster import ClickHouseCluster

DICTIONARY_FILES = ["configs/dictionaries/cache.xml"]

cluster = ClickHouseCluster(__file__)
instance = cluster.add_instance("instance", dictionaries=DICTIONARY_FILES)


@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()

        instance.query(
            """
            CREATE DATABASE IF NOT EXISTS test;
            DROP TABLE IF EXISTS test.source;
            CREATE TABLE test.source (id UInt64, key0 UInt8, key0_str String, key1 UInt8,
                    StartDate Date, EndDate Date,
                    UInt8_ UInt8, UInt16_ UInt16, UInt32_ UInt32, UInt64_ UInt64,
                    Int8_ Int8, Int16_ Int16, Int32_ Int32, Int64_ Int64,
                    Float32_ Float32, Float64_ Float64,
                    String_ String,
                    Date_ Date, DateTime_ DateTime, Parent UInt64) ENGINE=Log;
            """
        )

        yield cluster

    finally:
        cluster.shutdown()


def test_null_value(started_cluster):
    query = instance.query

    assert query("select dictGetUInt8('cache', 'UInt8_', toUInt64(12121212))") == "1\n"
    assert (
        query("select dictGetString('cache', 'String_', toUInt64(12121212))")
        == "implicit-default\n"
    )
    assert (
        query("select dictGetDate('cache', 'Date_', toUInt64(12121212))")
        == "2015-11-25\n"
    )

    # Check, that empty null_value interprets as default value
    assert (
        query("select dictGetUInt64('cache', 'UInt64_', toUInt64(12121212))") == "0\n"
    )
    assert (
        query(
            "select toTimeZone(dictGetDateTime('cache', 'DateTime_', toUInt64(12121212)), 'UTC')"
        )
        == "1970-01-01 00:00:00\n"
    )