hdfswriter/src/main/java/com/alibaba/datax/plugin/writer/hdfswriter/ParquetFileSupport.java [475:492]:
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    private void writeStruct(GroupType groupType, JSON value, int index) {
        if (value == null) {
            return;
        }
        JSONObject json = (JSONObject) value;
        if (json.isEmpty()) {
            return;
        }

        recordConsumer.startField(groupType.getName(), index);
        // struct start
        recordConsumer.startGroup();

        writeFields(groupType.getFields(), json);
        recordConsumer.endGroup();
        // struct end
        recordConsumer.endField(groupType.getName(), index);
    }
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osswriter/src/main/java/com/alibaba/datax/plugin/writer/osswriter/parquet/ParquetFileSupport.java [231:248]:
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    private void writeStruct(GroupType groupType, JSON value, int index) {
        if (value == null) {
            return;
        }
        JSONObject json = (JSONObject) value;
        if (json.isEmpty()) {
            return;
        }

        recordConsumer.startField(groupType.getName(), index);
        // struct start
        recordConsumer.startGroup();

        writeFields(groupType.getFields(), json);
        recordConsumer.endGroup();
        // struct end
        recordConsumer.endField(groupType.getName(), index);
    }
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