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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/08/05 14:51:11 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #3042: Error pruning `IsNull` expressions: Column 'instance_null_count' is declared as non-nullable but contains null values

alamb commented on issue #3042:
URL: https://github.com/apache/arrow-datafusion/issues/3042#issuecomment-1206544215

   This appears to be a regression of the code introduced in #1595. It means predicate pruning will not happens if an expression contains an `IsNull` and the statistics don't provide a `NullCount` so I am not sure how important it is in practice
   
   https://github.com/apache/arrow-rs/issues/1888 (in arrow `17.0.0`) where this error comes from started enforcing that the null declaration was correct , introduced by https://github.com/apache/arrow-datafusion/pull/2778
   
   It looks like there weren't any tests that found it.
   


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