cyb70289 edited a comment on pull request #10184:
URL: https://github.com/apache/arrow/pull/10184#issuecomment-828213344


   Turns out there are more "buffers[0]->data()" codes where "buffers[0]" is 
not checked for null.
   Unit test doesn't cover the case that input contains no nulls.
   - Three in 
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/scalar_boolean.cc
   - One in 
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/hash_aggregate.cc
   
   Shall we include all fixes in this single PR? @kszucs @pitrou 
   
   **EDIT: fixes included in this pr.**


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