ddl: fix parallel execution of "drop DB" and other DDL issue (#17566)#17657

Merged

bb7133 merged 1 commit intopingcap:release-3.0from sre-bot:release-3.0-788dc28a7423

Jun 4, 2020

+16-4

Commits on Jun 4, 2020

cherry pick pingcap#17566 to release-3.0

zimulala
authored and
sre-bot
committed