[jira] [Resolved] (ARROW-16280) [C++] Avoid copying shared_ptr in Expression::type()

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-16280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li resolved ARROW-16280.
------------------------------
    Fix Version/s: 8.0.0
       Resolution: Fixed

Issue resolved by pull request 12957
[https://github.com/apache/arrow/pull/12957]

> [C++] Avoid copying shared_ptr in Expression::type()
> ----------------------------------------------------
>
>                 Key: ARROW-16280
>                 URL: https://issues.apache.org/jira/browse/ARROW-16280
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: C++
>            Reporter: Tobias Zagorni
>            Assignee: Tobias Zagorni
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Split off from ARROW-16161, since this is a fairly straightforward fix and completely independent of ExecBatch.
> Expression::type() currently copies a shared_ptr<DataType>, while the return value is often used directly. We can avoid copying the shared_ptr, by returning a reference to it. This reduces thread contention on these shared_ptrs (ARROW-16161).



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