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https://issues.apache.org/jira/browse/ARROW-12632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson updated ARROW-12632:
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Fix Version/s: (was: 9.0.0)
> [C++][Dataset][Compute] Add support for dictionary_encode to Expression
> -----------------------------------------------------------------------
>
> Key: ARROW-12632
> URL: https://issues.apache.org/jira/browse/ARROW-12632
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Affects Versions: 4.0.0
> Reporter: Ben Kietzman
> Assignee: Ben Kietzman
> Priority: Major
> Labels: dataset
>
> dictionary_encode should be usable in the context of ExecuteScalarExpression,
> but is not currently supported because it requires mutable state (the hash
> table). Currently scanning assumes that Expression state will not be mutated
> so only one instance is initialized and is shared between all threads of
> execution. Supporting dictionary_encode will require adding support for
> multiple states to Expression and usage of that by dataset scans.
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