[jira] [Updated] (ARROW-17770) [C++][Gandiva] Fix const correctness of Gandiva projector Evaluate

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-17770:
-----------------------------------
    Labels: pull-request-available  (was: )

> [C++][Gandiva] Fix const correctness of Gandiva projector Evaluate
> ------------------------------------------------------------------
>
>                 Key: ARROW-17770
>                 URL: https://issues.apache.org/jira/browse/ARROW-17770
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++ - Gandiva
>    Affects Versions: 9.0.0
>            Reporter: Jin Shang
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> I was trying to figure out the thread-safeness of Gandiva projector evaluation, i.e., whether I can use a single Projector to evaluate multiple inputs concurrently. I assumed it isn't safe because the Evaluate function is not marked const. However, as far as I understand, the Evaluate function merely executes a compiled function on the input, which doesn't modify a project's internal states and should be const.



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