expression: fallback vectorized control expressions (#19367) #19749
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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SunRunAway
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Sep 4, 2020
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cherry-pick #19367 to release-4.0
What problem does this PR solve?
Issue Number: close #17725
Problem Summary: the vectorized execution runs each branch, some of them cause unnecessary errors. In fact, the later computation depends on the results of formers, the vectorization of laters should consider the formers. This needs to change the interface of vectorization of expressions.
We add fallback mechnism to avoid unnecessary warnings or errors. If errors/warnings occur for unsure branches, we fallback the vectorization to scalar execution.
In addition, the constant folding case is in #19675.
What is changed and how it works?
Proposal: xxx
What's Changed: disable vectroization in the source file of control expressions.
How it Works:
Related changes
pingcap/docs/pingcap/docs-cn:Check List
Tests
Release note