@Explain(displayName = "table name", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public String getTableName() {
    return tableName.getNotEmptyDbTable();
  }
DDL task description for TRUNCATE TABLE commands.
ql/src/java/org/apache/hadoop/hive/ql/ddl/table/misc/truncate/TruncateTableDesc.java