private void checkAndClose(PreparedStatement st) {
        if (null != st) {
            try {
                st.close();
            } catch (Exception e) {
                LOG.error("CheckAndClose PreparedStatement get err:", e);
            }
        }
    }
get getPkNames from query db.tb

@return a list of PkNames.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/jdbc/src/main/java/org/apache/inlong/sort/jdbc/table/AbstractJdbcDialect.java