@Explain(displayName = "extended", displayOnlyOnTrue=true,
      explainLevels = { Explain.Level.USER, Explain.Level.DEFAULT, Explain.Level.EXTENDED })
  public boolean isExtended() {
    return isExtended;
  }
DDL task description for DESC CATALOG commands.
ql/src/java/org/apache/hadoop/hive/ql/ddl/catalog/desc/DescCatalogDesc.java