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Add alwaysReturnsEmptySet for Merge Join

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vdimir 2021-08-02 13:49:56 +03:00
parent d9f55a3f31
commit 7364f35da6
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3 changed files with 25 additions and 0 deletions
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2
src/Interpreters/MergeJoin.h
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@ -32,6 +32,8 @@ public:
size_t getTotalRowCount() const override { return right_blocks.row_count; }
size_t getTotalByteCount() const override { return right_blocks.bytes; }
/// Has to be called only after setTotals()/mergeRightBlocks()
bool alwaysReturnsEmptySet() const override { return (is_right || is_inner) && min_max_right_blocks.empty(); }
BlockInputStreamPtr createStreamWithNonJoinedRows(const Block & result_sample_block, UInt64 max_block_size) const override;

17
tests/queries/0_stateless/01015_empty_in_inner_right_join.reference
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@ -15,3 +15,20 @@ multiple sets INNER JOIN empty set AND IN non-empty set 0
multiple sets INNER JOIN non-empty set AND IN non-empty set 1
IN empty set equals 0 10
IN empty set sum if 10
IN empty set 0
IN non-empty set 1
NOT IN empty set 10
INNER JOIN empty set 0
INNER JOIN non-empty set 1
RIGHT JOIN empty set 0
RIGHT JOIN non-empty set 1
LEFT JOIN empty set 10
LEFT JOIN non-empty set 10
multiple sets IN empty set OR IN non-empty set 1
multiple sets IN empty set OR NOT IN non-empty set 9
multiple sets NOT IN empty set AND IN non-empty set 1
multiple sets INNER JOIN empty set AND IN empty set 0
multiple sets INNER JOIN empty set AND IN non-empty set 0
multiple sets INNER JOIN non-empty set AND IN non-empty set 1
IN empty set equals 0 10
IN empty set sum if 10

6
tests/queries/0_stateless/01015_empty_in_inner_right_join.sql → tests/queries/0_stateless/01015_empty_in_inner_right_join.sql.j2
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@ -1,5 +1,9 @@
SET joined_subquery_requires_alias = 0;
{% for join_algorithm in ['partial_merge', 'hash'] -%}
SET join_algorithm = '{{ join_algorithm }}';
SELECT 'IN empty set',count() FROM system.numbers WHERE number IN (SELECT toUInt64(1) WHERE 0);
SELECT 'IN non-empty set',count() FROM (SELECT number FROM system.numbers LIMIT 10) t1 WHERE t1.number IN (SELECT toUInt64(1) WHERE 1);
SELECT 'NOT IN empty set',count() FROM (SELECT number FROM system.numbers LIMIT 10) WHERE number NOT IN (SELECT toUInt64(1) WHERE 0);
@ -22,3 +26,5 @@ SELECT 'multiple sets INNER JOIN non-empty set AND IN non-empty set',count() FRO
SELECT 'IN empty set equals 0', count() FROM numbers(10) WHERE (number IN (SELECT toUInt64(1) WHERE 0)) = 0;
SELECT 'IN empty set sum if', sum(if(number IN (SELECT toUInt64(1) WHERE 0), 2, 1)) FROM numbers(10);
{% endfor -%}