parser: add test case for where clause in select
parser: add test case for where clause in select

where clause in update and delete is already covered in parser_test.go.

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