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https://issues.apache.org/jira/browse/ARROW-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jorge Leitão updated ARROW-10971:
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Priority: Blocker (was: Major)
> [Rust][DataFusion] Left Join implementation is wrong for multiple batches on
> right side
> ---------------------------------------------------------------------------------------
>
> Key: ARROW-10971
> URL: https://issues.apache.org/jira/browse/ARROW-10971
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Daniël Heres
> Priority: Blocker
>
> Currently the left join generates a null for every row that is not present in
> the right batch.
> However, this is wrong, as there should be no math in _all_ of the right
> batches.
> The current implementation generates extra (left, none) tuples for every
> batch where the left side is not present.
> To fix it, we need to mark the keys or indexes on the left side as visited
> and scan the items once to generate the rows without any match.
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