default boolean shouldOverwrite(org.apache.hadoop.hive.ql.metadata.Table mTable, Context.Operation operation) {
    return false;
  }
Returns whether the data should be overwritten for the specific operation.
@param mTable the table.
@param operation operation type.
@return if the data should be overwritten for the specified operation.
ql/src/java/org/apache/hadoop/hive/ql/metadata/HiveStorageHandler.java