@Explain(displayName = "cascade", displayOnlyOnTrue = true,
      explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public boolean isCascade() {
    return isCascade;
  }
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