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

["Jin Shang (Jira)" <ji...@apache.org>]

Jin Shang created ARROW-17770:
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             Summary: [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


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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