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https://issues.apache.org/jira/browse/ARROW-16518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534322#comment-17534322
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Antoine Pitrou commented on ARROW-16518:
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This should certainly be optional.
> [Python] Ensure _exec_plan.execplan preserves order of inputs
> -------------------------------------------------------------
>
> Key: ARROW-16518
> URL: https://issues.apache.org/jira/browse/ARROW-16518
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: Python
> Reporter: Alessandro Molina
> Priority: Major
> Fix For: 9.0.0
>
>
> At the moment execplan doesn't guarantee any ordered output, the batches are
> consumed in a random order. This can lead to unordered outputs when
> `use_threads=True`
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