Fix bug in remove_join_expressions
#11693
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jonahgao
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Jul 28, 2024
jonahgao
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Jul 28, 2024
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| # Test issue: https://github.com/apache/datafusion/issues/11621 | ||
| query BB | ||
| SELECT * FROM t1 JOIN t2 ON t1.v1 = t2.v1 WHERE (t1.v1 == t2.v1) OR t1.v1; |
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This query returns an empty result on the current main.
jonahgao
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Jul 28, 2024
| " Inner Join: t3.a = t4.a [a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32]", | ||
| " Inner Join: t1.a = t3.a [a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32]", | ||
| " Filter: t2.c < UInt32(15) AND t2.c = UInt32(688) [a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32]", | ||
| " Filter: t2.c = UInt32(688) [a:UInt32, b:UInt32, c:UInt32, a:UInt32, b:UInt32, c:UInt32]", |
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Remove t1.a = t2.a from (t1.a = t2.a OR t2.c < 15) AND (t1.a = t2.a AND tc.2 = 688), and the result should be tc.2 = 688
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alamb
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Jul 29, 2024
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This makes sense to me. Thank you @jonahgao for the fix (and @2010YOUY01 for SQLancer that found it 🙏 )
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
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Thanks for the review @alamb |
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Which issue does this PR close?
Closes #11621.
Rationale for this change
Given an example query:
When removing the join predicate
t1.v1 = t2.v1from the parent filter(t1.v1 == t2.v1) OR t1.v1, this process can be considered as replacing the join predicate withtrue. The result should beTRUE OR t1.v1and further simplified to empty, but currently, it ist1.v1. This will lead to incorrect join results.What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?
No