[
https://issues.apache.org/jira/browse/ARROW-12632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Arrow JIRA Bot reassigned ARROW-12632:
---------------------------------------------
Assignee: (was: Ben Kietzman)
> [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
> 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
