ddl: improve an error handling (#5748)
ddl: improve an error handling (#5748)



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