[8.x] ESQL: Rewrite TO_UPPER/TO_LOWER comparisons (#118870)#119207
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elasticsearchmachine merged 3 commits intoelastic:8.xfrom Dec 23, 2024
Merged
[8.x] ESQL: Rewrite TO_UPPER/TO_LOWER comparisons (#118870)#119207elasticsearchmachine merged 3 commits intoelastic:8.xfrom
elasticsearchmachine merged 3 commits intoelastic:8.xfrom
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This adds an optimization rule to rewrite TO_UPPER/TO_LOWER comparisons against a string into an InsensitiveEquals comparison. The rewrite can also result right away into a TRUE/FALSE, in case the string doesn't match the caseness of the function. This also allows later pushing down the predicate to lucene as a case-insensitive term-query. Fixes elastic#118304.
TO_UPPER/TO_LOWER resolution incorrectly returned child's type (that could also be `null`, type `NULL`), instead of KEYWORD/TEXT. So a test like `TO_UPPER(null) == "..."` fails on type mismatch. This was fixed collaterally by elastic#114334 (8.17.0) Also, correct some of the tests skipping (that had however no impact, due to testing range). (cherry picked from commit edb3818)
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Backports the following commits to 8.x:
TO_UPPER(null)BWC tests prior to 8.17 #119213)