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【DM版本】:dm8_20230808_rev197096_x86_rh6_64
【问题描述】*：通过JDBC读取表的索引信息，
maven版本如下：

        <dependency>
            <groupId>com.dameng</groupId>
            <artifactId>dm-jdbc</artifactId>
            <version>1.8</version>
        </dependency>

代码如下：

DatabaseMetaData dbMetaData = connection.getMetaData();
            resultSet = dbMetaData.getIndexInfo(catalog, schema, tableName, false, false);
            Set<String> keys = getColumnNames(resultSet);
            while (resultSet.next()) {
                IndexInfo indexInfo = new IndexInfo();
                String type = resultSet.getString("TYPE");
                if (keys.contains("TABLE_CAT")) {
                    indexInfo.setTableCat(resultSet.getString("TABLE_CAT"));
                }
                if (keys.contains("TABLE_SCHEM")) {
                    indexInfo.setTableSchema(resultSet.getString("TABLE_SCHEM"));
                }
                if (keys.contains("TABLE_NAME")) {
                    indexInfo.setTableName(resultSet.getString("TABLE_NAME"));
                }
                if (keys.contains("NON_UNIQUE")) {
                    indexInfo.setNonUnique(resultSet.getBoolean("NON_UNIQUE"));
                }
                if (keys.contains("INDEX_QUALIFIER")) {
                    indexInfo.setIndexQualifier(resultSet.getString("INDEX_QUALIFIER"));
                }
                if (keys.contains("INDEX_NAME")) {
                    indexInfo.setIndexName(resultSet.getString("INDEX_NAME"));
                }
                if (keys.contains("TYPE")) {
                    indexInfo.setType(resultSet.getShort("TYPE"));
                }
                if (keys.contains("ORDINAL_POSITION")) {
                    indexInfo.setOrdinalPosition(resultSet.getShort("ORDINAL_POSITION"));
                }
                if (keys.contains("COLUMN_NAME")) {
                    indexInfo.setColumnName(resultSet.getString("COLUMN_NAME"));
                }
                if (keys.contains("ASC_OR_DESC")) {
                    indexInfo.setAscOrDesc(resultSet.getString("ASC_OR_DESC"));
                }
                if (keys.contains("CARDINALITY")) {
                    indexInfo.setCardinality(resultSet.getInt("CARDINALITY"));
                }
                if (keys.contains("PAGES")) {
                    indexInfo.setPages(resultSet.getLong("PAGES"));
                }
                if (keys.contains("FILTER_CONDITION")) {
                    indexInfo.setFilterCondition(resultSet.getString("FILTER_CONDITION"));
                }
                indexInfos.add(indexInfo);

读取结果没有可以区分主键索引和普通索引的属性，请问是否有办法解决？