ddl: fix issue `pre_split_regions` table option doesn't work in the partition table. (#18144)#18837

Merged

SunRunAway merged 4 commits intopingcap:release-4.0from ti-srebot:release-4.0-33f4b82166ad

Jul 29, 2020

+37-14

Commits on Jul 28, 2020

cherry pick pingcap#18144 to release-4.0

crazycs520
authored and
ti-srebot
committed

Commits on Jul 29, 2020