expression: fallback vectorized control expressions (#19367)#19749

Merged

SunRunAway merged 3 commits intopingcap:release-4.0from ti-srebot:release-4.0-d8b3d329cd94

Sep 4, 2020

+943-114

Commits on Sep 3, 2020

cherry pick pingcap#19367 to release-4.0

fzhedu
authored and
ti-srebot
committed

Commits on Sep 4, 2020