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https://issues.apache.org/jira/browse/ARROW-4110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767859#comment-16767859
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Wes McKinney commented on ARROW-4110:
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This is part of https://github.com/apache/arrow/pull/3642
> [C++] Do not generate distinct cast kernels when input and output type are
> the same
> -----------------------------------------------------------------------------------
>
> Key: ARROW-4110
> URL: https://issues.apache.org/jira/browse/ARROW-4110
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.13.0
>
>
> A side issue brought up by ARROW-4101 and ARROW-4102 is that the "identity
> cast" is handled on a type-by-type basis. We should see if we can have a
> "universal identity cast" and simplify things
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