@Override
  public void dropConstraint(String catName, String dbName, String tableName, String constraintName)
      throws TException {
    DropConstraintRequest rqst = new DropConstraintRequest(dbName, tableName, constraintName);
    rqst.setCatName(catName);
    client.drop_constraint(rqst);
  }
@param request
@throws MetaException
@throws NoSuchObjectException
@throws TException
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java