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https://issues.apache.org/jira/browse/FLINK-33759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849837#comment-17849837
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Jing Ge commented on FLINK-33759:
---------------------------------
master:
https://github.com/apache/flink/commit/57b20051a5aa6426d0a6ded71f5e0d550572428c
> flink parquet writer support write nested array or map type
> -----------------------------------------------------------
>
> Key: FLINK-33759
> URL: https://issues.apache.org/jira/browse/FLINK-33759
> Project: Flink
> Issue Type: Improvement
> Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
> Reporter: Cai Liuyang
> Priority: Major
> Labels: pull-request-available
>
> When we use flink-parquet format wirte Map<String, String>[] type (which will
> be read by spark job), we encounter an exception:
> {code:java}
> // code placeholder
> Caused by: org.apache.parquet.io.ParquetEncodingException: empty fields are
> illegal, the field should be ommited completely instead
> at
> org.apache.parquet.io.MessageColumnIO$MessageColumnIORecordConsumer.endField(MessageColumnIO.java:329)
> at
> org.apache.flink.formats.parquet.row.ParquetRowDataWriter$ArrayWriter.writeArrayData(ParquetRowDataWriter.java:438)
> at
> org.apache.flink.formats.parquet.row.ParquetRowDataWriter$ArrayWriter.write(ParquetRowDataWriter.java:419)
> at
> org.apache.flink.formats.parquet.row.ParquetRowDataWriter$RowWriter.write(ParquetRowDataWriter.java:471)
> at
> org.apache.flink.formats.parquet.row.ParquetRowDataWriter.write(ParquetRowDataWriter.java:81)
> at
> org.apache.flink.formats.parquet.row.ParquetRowDataBuilder$ParquetWriteSupport.write(ParquetRowDataBuilder.java:89){code}
> after review the code, we found flink-parquet doesn't support write nested
> array or map, because
> [[ArrayWriter|https://github.com/apache/flink/blob/master/flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/row/ParquetRowDataWriter.java#L437]|#L437]
> and
> [MapWriter|https://github.com/apache/flink/blob/master/flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/row/ParquetRowDataWriter.java#L391]
> doesn't impl `public void write(ArrayData arrayData, int ordinal) {}`
> function.
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