tustvold opened a new issue #1224:
URL: https://github.com/apache/arrow-rs/issues/1224


   **Describe the bug**
   
   `MutableArrayData` contains logic to skip computing a null mask if the 
source data contains no nulls. In such a scenario it skips pre-allocating space 
for the null buffer. However, it continues to then build this null buffer?! 
   
   **To Reproduce**
   
   Run the filter benchmarks, observe memory allocations taking place in 
`build_extend_null_bits::closure`
   
   **Expected behavior**
   
   `MutableArrayData` should fully skip computing the null mask
   


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