public boolean isSplitUpdate() {
      return (description & SPLIT_UPDATE_BIT) > 0;
    }
Sets the hash-based merge property for ACID operations that combines delta files using
GRACE hash join based approach, when turned on. (Currently unimplemented!)
@param isHashBasedMerge a boolean property that turns on hash-based merge when true.
@return the acidOperationalProperties object.
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java