js8544 opened a new pull request, #14165:
URL: https://github.com/apache/arrow/pull/14165

   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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