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https://issues.apache.org/jira/browse/ARROW-843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16805967#comment-16805967
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Wes McKinney commented on ARROW-843:
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I changed this to a C++ issue since a lot of the datasets logic will be
migrated to C++ from where it's in Python now
> [C++] Parquet merging unequal but equivalent schemas
> ----------------------------------------------------
>
> Key: ARROW-843
> URL: https://issues.apache.org/jira/browse/ARROW-843
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Labels: dataset, parquet
> Fix For: 0.14.0
>
>
> Some Parquet datasets may contain schemas with mixed REQUIRED/OPTIONAL
> repetition types. While such schemas aren't strictly equal, we will need to
> consider them equivalent on the read path
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