emkornfield commented on pull request #12216:
URL: https://github.com/apache/arrow/pull/12216#issuecomment-1023674858


   I wonder if we are undersizing the buffer for when the 
[memcpy][https://github.com/apache/arrow/blob/03f3cf986314654e932587d01df59ad145faf5b9/cpp/src/arrow/util/bitmap_writer.h#L139]
 happens.  Does the problem go away if we allocate more space for the validity 
bitmap?


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