@Explain(displayName = "properties", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public Map<String, String> getProps() {
    return props;
  }
Abstract ancestor of all ALTER TABLE descriptors that are handled by the AlterTableWithWriteIdOperations framework.
ql/src/java/org/apache/hadoop/hive/ql/ddl/table/AbstractAlterTableDesc.java