parser: tiny clean up (#2504)
parser: tiny clean up (#2504)


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