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

["Yibo Cai (Jira)" <ji...@apache.org>]

Yibo Cai created ARROW-15493:
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             Summary: [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


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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