public static List<Map<String, Object>> jsonNode2Map(JsonNode data) {
        if (data == null) {
            return new ArrayList<>();
        }
        List<Map<String, Object>> values = new ArrayList<>();
        if (data.isArray()) {
            for (int i = 0; i < data.size(); i++) {
                values.add(jsonObject2Map(data.get(0)));
            }
        } else {
            values.add(jsonObject2Map(data));
        }
        return values;
    }
Convert json node to hash map.
Lowercase the keys of map, because Oracle cdc sends record with uppercase field name, but hive table only
supports lowercase field name

@param data json node
@return list of map data
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/hive/src/main/java/org/apache/inlong/sort/hive/util/HiveTableUtil.java