bkietz opened a new pull request #9471:
URL: https://github.com/apache/arrow/pull/9471


   Comparison kernels generate an output bitmap for all array values, including 
those masked by a null bit. This should be fine since the indeterminate bits 
are also masked in the output but valgrind still triggers on the branching in 
GenerateBitsUnrolled.
   
   Fix: replace branching with equivalent multiplication.


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