expression: fix a bug that the coercibilities of enum and set are wrong (#20274)#20364

Merged

ti-srebot merged 3 commits intopingcap:release-4.0from ti-srebot:release-4.0-2f8092ea841d

Oct 14, 2020

+15-3

Commits on Oct 9, 2020

cherry pick pingcap#20274 to release-4.0

wjhuang2016
authored and
ti-srebot
committed
Update integration_test.go
wjhuang2016
authored

Commits on Oct 14, 2020

Merge branch 'release-4.0' into release-4.0-2f8092ea841d
ti-srebot
authored