expression: fix incompatible last_day func behavior in sql mode (#25953)#26000

Merged

ti-chi-bot merged 2 commits intopingcap:release-5.0from ti-srebot:release-5.0-5a07699871d7

Sep 3, 2021

+27-14

Commits on Jul 6, 2021

cherry pick pingcap#25953 to release-5.0

lzmhhh123
authored and
ti-srebot
committed

Commits on Sep 3, 2021

Merge branch 'release-5.0' into release-5.0-5a07699871d7
ti-chi-bot
authored