parser: Add charset info for string literal
parser: Add charset info for string literal

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