make load_data test clean (#7536)
make load_data test clean (#7536)


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