session: validate value for global time_zone sys variable (#8876)#8879

Merged

zz-jason merged 1 commit intopingcap:release-2.1from eurekaka:release-2.1

Dec 29, 2018

+6-1

Commits on Dec 28, 2018

session: validate value for global time_zone sys variable (pingcap#8876 )
eurekaka
committed