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https://issues.apache.org/jira/browse/ARROW-11991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332396#comment-17332396
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Andrew Lamb commented on ARROW-11991:
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Migrated to github: https://github.com/apache/arrow-datafusion/issues/189
> [Rust][DataFusion] Maintain partition information in Union
> ----------------------------------------------------------
>
> Key: ARROW-11991
> URL: https://issues.apache.org/jira/browse/ARROW-11991
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust - DataFusion
> Reporter: Daniël Heres
> Priority: Major
> Labels: pull-request-available
> Time Spent: 5h 20m
> Remaining Estimate: 0h
>
> Currently it returns Partitioning::UnknownPartitioning(num_partitions) based
> on the sum of partition counts (if available) of the underlying inputs. In
> case of another partition scheme - such as hash partitioning, it would be
> better to keep that information available, so other optimizations could be
> used.
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