ClickHouse/tests/integration/test_explain_estimates/test.py

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import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance('instance')
@pytest.fixture(scope="module")
def start_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def test_explain_estimates(start_cluster):
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node1.query("CREATE TABLE test (i Int64) ENGINE = MergeTree() ORDER BY i SETTINGS index_granularity = 16, write_final_mark = 0")
node1.query("INSERT INTO test SELECT number FROM numbers(128)")
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node1.query("OPTIMIZE TABLE test")
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system_parts_result = node1.query("SELECT any(database), any(table), count() as parts, sum(rows) as rows, sum(marks) as marks FROM system.parts WHERE database = 'default' AND table = 'test' and active = 1 GROUP BY (database, table)")
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explain_estimates_result = node1.query("EXPLAIN ESTIMATE SELECT * FROM test")
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assert(system_parts_result == explain_estimates_result)