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support LEAST() in TiFlash #32787

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guo-shaoge opened this issue Mar 3, 2022 · 0 comments · Fixed by #32788
Closed

support LEAST() in TiFlash #32787

guo-shaoge opened this issue Mar 3, 2022 · 0 comments · Fixed by #32788
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type/feature-request Categorizes issue or PR as related to a new feature.

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@guo-shaoge
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Feature Request

Is your feature request related to a problem? Please describe:

related tiflash issue: pingcap/tiflash#3358
Describe the feature you'd like:

support LEAST()/GREATEST() in TiFlash for int and real.
Describe alternatives you've considered:

MySQL docs:
https://dev.mysql.com/doc/refman/8.0/en/comparison-operators.html#function_least
TiDB implementation:

tidb/expression/builtin_compare.go

Line 684 in b561dfa

func (c *leastFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {

Teachability, Documentation, Adoption, Migration Strategy:
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expression: enable greatest/least push down to tiflash guo-shaoge/tidb
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