@Override
                    public void close() throws SQLException {
                        try {
                            super.close();
                        } finally {
                            stmt2.close();
                            reset();
                            endContext(context);
                        }
                    }
Execute the clause and return the generated keys as a ResultSet

@return result set with generated keys
querydsl-sql/src/main/java/com/querydsl/sql/dml/SQLMergeClause.java