expression: support JSON return type in `case` expression#8355

Merged

eurekaka merged 5 commits intopingcap:masterfrom eurekaka:case_json

Nov 21, 2018

Commits on Nov 16, 2018

expression: support JSON return type in case expression
eurekaka
committed

Commits on Nov 20, 2018

Merge branch 'master' into case_json
eurekaka
authored

Commits on Nov 21, 2018