executor: fix data race (#2134)
executor: fix data race (#2134)


andelf/tidb,c4pt0r/tidb,silentred/tidb,simon-xia/tidb,mccxj/tidb,ming-relax/tidb,ngaut/tidb,yuanwhy/tidb,cosmtrek/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,coocood/tidb,pingcap/tidb,silenceper/tidb,ngaut/tidb,JinheLin/tidb,wusphinx/tidb,gaocegege/tidb,qiuyesuifeng/tidb,XuHuaiyu/tidb,pingcap/tidb,spongedu/tidb,spongedu/tidb,Cofyc/tidb,louishust/tidb,kyle-wang/tidb,coocood/tidb,ueizhou/tidb,simon-xia/tidb,yuanwhy/tidb,myrice/tidb,CodeRushing/tidb,cosmtrek/tidb,c4pt0r/tidb,yangwenmai/tidb,kyle-wang/tidb,zs634134578/tidb,ngaut/tidb,astaxie/tidb,XuHuaiyu/tidb,ngaut/tidb,louishust/tidb,CodeRushing/tidb,mccxj/tidb,ueizhou/tidb,pingcap/tidb,pingcap/tidb,8cbx/tidb,kyle-wang/tidb,tiancaiamao/tidb,JinheLin/tidb,Nify/tidb,silenceper/tidb,qiuyesuifeng/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,Cofyc/tidb,ngaut/tidb,kyle-wang/tidb,gaocegege/tidb,qhsong/tidb,astaxie/tidb,anywhy/tidb,kyle-wang/tidb,zs634134578/tidb,liyu4/tidb,myrice/tidb,tiancaiamao/tidb,wusphinx/tidb,c4pt0r/tidb,anywhy/tidb,Nify/tidb,kyle-wang/tidb,qhsong/tidb,zimulala/tidb,ming-relax/tidb,c4pt0r/tidb,zimulala/tidb,8cbx/tidb,liyu4/tidb,andelf/tidb,yangwenmai/tidb,silentred/tidb,ngaut/tidb