use single batch for insert (#9406)
use single batch for insert (#9406)


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