private void verifyDeleteDeltaDir(int expectedDeltas, String tblName, String partName) throws Exception {
    verifyDir(expectedDeltas, tblName, partName, "delete_delta_.*");
  }
Test cleaner for TXN_TO_WRITE_ID table.
@throws Exception
ql/src/test/org/apache/hadoop/hive/ql/TestTxnCommands2.java