plan: rename dagPhysicalOptimize to physicalOptimize (#6117)
plan: rename dagPhysicalOptimize to physicalOptimize (#6117)


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