executor: fix wrong runtime stats record in index merge join (#12925)
executor: fix wrong runtime stats record in index merge join (#12925)


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