planner, executor: eliminate extra columns introduced by OrderBy upon Union (#8290)#8307

Merged

zz-jason merged 1 commit intopingcap:release-2.0from AndrewDi:release-2.0

Nov 14, 2018

+37-2

Commits on Nov 14, 2018

planner, executor: eliminate extra columns introduced by OrderBy upon Union (pingcap#8290 )
AndrewDi
committed