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https://issues.apache.org/jira/browse/ARROW-13851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li updated ARROW-13851:
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Summary: [C++] Automatically cast dictionary indices during merge (was:
Automatically cast dictionary indices during merge)
> [C++] Automatically cast dictionary indices during merge
> --------------------------------------------------------
>
> Key: ARROW-13851
> URL: https://issues.apache.org/jira/browse/ARROW-13851
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++, Python
> Affects Versions: 5.0.0
> Reporter: Kyle Kavanagh
> Priority: Major
>
> Following ARROW-11673,
> It seems users still need to manually up-cast index types when trying to
> concatenate tables. Would be great if this could be handled automatically
>
> {code:java}
> pyarrow.lib.ArrowInvalid: Unable to merge: Field X has incompatible types:
> dictionary<values=string, indices=int32, ordered=0> vs
> dictionary<values=string, indices=int16, ordered=0>
> {code}
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