expression: fix unmatched column lengths errors ca ... (#19754) #19758
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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/run-all-tests |
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builtinGreatestStringSig and builtinLeastStringSig (#19754)
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cherry-pick #19754 to release-4.0
What problem does this PR solve?
Issue Number: close #16147
Problem Summary: expression: fix unmatched column lengths errors caused by
builtinGreatestStringSigandbuiltinLeastStringSigWhat is changed and how it works?
Built-in functions
builtinGreatestStringSigandbuiltinLeastStringSigallocate buffers from their own buffer pool, but they don't initialize allocated buffers before using them, which may cause some problems.Check List
Tests
Release note
builtinGreatestStringSigandbuiltinLeastStringSig