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https://issues.apache.org/jira/browse/ARROW-12524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17333343#comment-17333343
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Micah Kornfield commented on ARROW-12524:
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Yeah, I think we likely could only support sparse array representation natively
in parquet (struct of selector, and columns) and we would need to do the
conversion on encoding/decoding.
> [Parquet][C++] Support arrow dense union type in Parquet
> --------------------------------------------------------
>
> Key: ARROW-12524
> URL: https://issues.apache.org/jira/browse/ARROW-12524
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++, Parquet
> Reporter: ZMZ91
> Priority: Major
>
> Dense union type is not supported yet in Parquet
> [https://github.com/apache/arrow/blob/8e43f23dcc6a9e630516228f110c48b64d13cec6/cpp/src/parquet/arrow/schema.cc#L382]
> . Is it on schedule to support it nearly? If I'd implement this myself, is
> there any other codes to take care of? Thanks.
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