9prady9 commented on pull request #12080:
URL: https://github.com/apache/arrow/pull/12080#issuecomment-1049507634


   I have been able to successfully avoid bitmap allocation for the case where 
null handling is `INTERSECTION` and all input Datums have all valid values. One 
simple test case has been added for cast kernel, I would think adding such 
tests for all compute functions would be prudent.
   
   I did however encounter one unexpected error when in an existing unit test 
`TestCallScalarFunction.PreallocationCases`. At this moment, I am not sure why 
a modified context would change Datum kind. Please see the error message of 
test failure 
   ```
   
/home/pradeep/gitroot/ArrowWorkspace/worktrees/15118/cpp/src/arrow/datum.cc:71: 
 
   Check failed: (Datum::ARRAY) == (this->kind()) 
   ```
   This is triggered from line 789 of `exec_test.cc`. There is an identical 
test just few lines above where context argument isn't passed along and that 
runs fine.
   
   Any hints at what I am missing here is appreciated. Thank you!
   
   Command to run the specific test to see the problem on my branch is given 
below:
   
   ```
   ./debug/arrow-compute-internals-test 
--gtest_filter=TestCallScalarFunction.PreallocationCases
   ```
   assuming build type is `debug`
   
   @lidavidm  @edponce 


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