executor: remove Next function for IndexLookUpJoin (#5994)
executor: remove Next function for IndexLookUpJoin (#5994)


c4pt0r/tidb,ngaut/tidb,XuHuaiyu/tidb,ngaut/tidb,wusphinx/tidb,pingcap/tidb,XuHuaiyu/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,coocood/tidb,EvilMcJerkface/tidb,ngaut/tidb,ngaut/tidb,qiuyesuifeng/tidb,cosmtrek/tidb,ming-relax/tidb,kyle-wang/tidb,kyle-wang/tidb,Cofyc/tidb,cosmtrek/tidb,c4pt0r/tidb,kyle-wang/tidb,qiuyesuifeng/tidb,Cofyc/tidb,pingcap/tidb,coocood/tidb,kyle-wang/tidb,mccxj/tidb,c4pt0r/tidb,CodeRushing/tidb,CodeRushing/tidb,c4pt0r/tidb,Nify/tidb,ngaut/tidb,Nify/tidb,wusphinx/tidb,ming-relax/tidb,pingcap/tidb,ngaut/tidb,tiancaiamao/tidb,tiancaiamao/tidb,EvilMcJerkface/tidb,mccxj/tidb,kyle-wang/tidb,c4pt0r/tidb