*: rename getGlobalVar to getExecRet and update comments
*: rename getGlobalVar to getExecRet and update comments

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