executor: remove Next function of IndexReaderExecutor (#6165)
executor: remove Next function of IndexReaderExecutor (#6165)


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