@Explain(displayName = "table", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public String getDbTableName() {
    return tableName.getNotEmptyDbTable();
  }
DDL task description for DESC table_name commands.
ql/src/java/org/apache/hadoop/hive/ql/ddl/table/info/desc/DescTableDesc.java