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Posted to github@datafusion.apache.org by "Braedon-Wooding-Displayr (via GitHub)" <gi...@apache.org> on 2026/10/18 10:20:37 UTC

[I] Parquet scans still set up a reader for files whose row groups are all pruned [datafusion]

Braedon-Wooding-Displayr opened a new issue, #26475:
URL: https://github.com/apache/datafusion/issues/26475

   ### Describe the bug
   
   A selective filter over Parquet files still pays to set up a reader for every file range, even when row-group statistics or Bloom filters have already ruled out every row group in it. On wide tables that setup grows with the column count, so a query that reads nothing from most files still spends CPU opening each one.
   
   ### To Reproduce
   
   I've got a PR for this so I'm not going heavy into that, and well it's a relatively obvious change.
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   _No response_
   
   ### Willingness to contribute
   
   None


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Re: [I] Parquet scans still set up a reader for files whose row groups are all pruned [datafusion]

Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb closed issue #26475: Parquet scans still set up a reader for files whose row groups are all pruned
URL: https://github.com/apache/datafusion/issues/26475


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