test: fix ddl test duplicated test cases due to wrong embedding struct (#13886)
test: fix ddl test duplicated test cases due to wrong embedding struct (#13886)


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