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https://issues.apache.org/jira/browse/ARROW-843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman resolved ARROW-843.
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Resolution: Fixed
Issue resolved by pull request 6024
[https://github.com/apache/arrow/pull/6024]
> [C++] Implement Schema unification, 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++, C++ - Dataset
> Reporter: Wes McKinney
> Assignee: Francois Saint-Jacques
> Priority: Major
> Labels: dataset, parquet, pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> 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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