@Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((tTable == null) ? 0 : tTable.hashCode());
    return result;
  }
Marker SemanticException, so that processing that allows for table validation failures
and appropriately handles them can recover from these types of SemanticExceptions
ql/src/java/org/apache/hadoop/hive/ql/metadata/Table.java