laserninja commented on issue #16032:
URL: https://github.com/apache/iceberg/issues/16032#issuecomment-4320389428

   Sure! I've added `TestParquetFilters` with tests that cover this. The key 
test is `alwaysFalseReturnsNoop()`. Before the fix, `ParquetFilters.convert()` 
would pass the internal `AlwaysFalse.INSTANCE` sentinel through to 
`FilterCompat.get(pred)`, which Parquet doesn't understand. After the fix it 
correctly returns `FilterCompat.NOOP`.
   Additional tests verify the existing `AlwaysTrue` → NOOP behavior, that real 
predicates still produce active filters, and that composite expressions like 
`not(alwaysFalse)` and `and(alwaysFalse, pred)` also resolve to NOOP via the 
visitor's existing handling.
   The one-line fix adds `&& pred != AlwaysFalse.INSTANCE` to the null/sentinel 
check in `convert()`. Will open a PR shortly.


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