[jira] [Commented] (ARROW-15493) [C++][Gandiva] Uninitialized data member causes random gandiva-filter-test failures

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-15493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483680#comment-17483680 ] 

Antoine Pitrou commented on ARROW-15493:
----------------------------------------

Thanks for debugging this. This comes from time to time on CI.

> [C++][Gandiva] Uninitialized data member causes random gandiva-filter-test failures
> -----------------------------------------------------------------------------------
>
>                 Key: ARROW-15493
>                 URL: https://issues.apache.org/jira/browse/ARROW-15493
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++ - Gandiva
>            Reporter: Yibo Cai
>            Assignee: Yibo Cai
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> gandiva-filter-test {{TestFilter.TestFilterCache}} fails on Arm, though the bug is not architecure dependent.
> Class member *mode_* is not initialized in one of ExpressionCacheKey constructors [1], but it's used to comapre equality of two instances [2]. It causes flaky gandiva-filter-test failures.
> [1] https://github.com/apache/arrow/blob/master/cpp/src/gandiva/expression_cache_key.h#L55
> [2] https://github.com/apache/arrow/blob/master/cpp/src/gandiva/expression_cache_key.h#L92



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