emkornfield commented on pull request #12216:
URL: https://github.com/apache/arrow/pull/12216#issuecomment-1023871928


   If this is more then an off-by overwrite error I think there might be deeper 
problems.  Just need to think about if it is an error in the Levels to Bitmap 
function that is writing when it shouldn't be or somehow we are getting the 
math wrong, passing down the wrong number for passing the upper bound on values.
   
   But i do think 
https://github.com/apache/arrow/blob/b1ae6029687aa3bb756c61a189c88125128cf026/cpp/src/parquet/level_conversion_inc.h#L336
   
   should be taking values_read_upper_bound instead of num_def_levels. 


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