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Merge pull request #40104 from ClickHouse/counting-resources-in-subqueries

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A test for counting resources in subqueries
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Alexey Milovidov 2022-08-13 08:08:35 +03:00 committed by GitHub
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tests/queries/1_stateful/00175_counting_resources_in_subqueries.reference Normal file
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tests/queries/1_stateful/00175_counting_resources_in_subqueries.sql Normal file
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-- the work for scalar subquery is properly accounted:
SET max_rows_to_read = 1000000;
SELECT 1 = (SELECT count() FROM test.hits WHERE NOT ignore(AdvEngineID)); -- { serverError 158 }
-- the work for subquery in IN is properly accounted:
SET max_rows_to_read = 1000000;
SELECT 1 IN (SELECT count() FROM test.hits WHERE NOT ignore(AdvEngineID)); -- { serverError 158 }
-- this query reads from the table twice:
SET max_rows_to_read = 15000000;
SELECT count() IN (SELECT count() FROM test.hits WHERE NOT ignore(AdvEngineID)) FROM test.hits WHERE NOT ignore(AdvEngineID); -- { serverError 158 }
-- the resources are properly accounted even if the subquery is evaluated in advance to facilitate the index analysis.
-- this query is using index and filter out the second reading pass.
SET max_rows_to_read = 1000000;
SELECT count() FROM test.hits WHERE CounterID > (SELECT count() FROM test.hits WHERE NOT ignore(AdvEngineID)); -- { serverError 158 }
-- this query is using index but have to read all the data twice.
SET max_rows_to_read = 10000000;
SELECT count() FROM test.hits WHERE CounterID < (SELECT count() FROM test.hits WHERE NOT ignore(AdvEngineID)); -- { serverError 158 }