functions-and-operators: function STDDEV is supported (#4504)#4506

Merged

TomShawn merged 1 commit intopingcap:release-3.0from ti-srebot:release-3.0-ffff46c21150

Sep 15, 2020

-1

Commits on Sep 15, 2020

cherry pick pingcap#4504 to release-3.0

SunRunAway
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ti-srebot
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