wgtmac commented on PR #35455:
URL: https://github.com/apache/arrow/pull/35455#issuecomment-1544291922

   > I guess maybe a user previously uses page filter. Now when he/she enables 
page index, the filter would not work
   
   I think the documentation is also missing for stats filtering on the page 
header. Since page index is an ongoing effort and it is not enabled by default, 
users will not get confused by this for now.
   
   > About statistics, though nan will break the page index, and page 
statistics and make full use of nan-counts. I think this on-going patch helps 
https://github.com/apache/parquet-format/pull/196
   
   Due to the inactivity in that PR, I assume it will take a long time to move 
forward as we need somehow to reach a consensus from the community.


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