pvary commented on PR #16110:
URL: https://github.com/apache/iceberg/pull/16110#issuecomment-4405189871
Shall we add a new predicate for the `Ignored` columns and handle this
upstream in the expression? Then we could have a "correct" result in many cases.
```
/**
* Sentinel marker for a predicate that referenced a column outside the
allowed set and therefore
* cannot be evaluated. Distinct from {@link AlwaysTrue} so that {@code
not(IGNORED)} does not
* become {@code AlwaysFalse} and {@code or(x, IGNORED)} does not silently
drop matching rows.
*/
private static class Ignored implements FilterPredicate {
static final Ignored INSTANCE = new Ignored();
@Override
public <R> R accept(Visitor<R> visitor) {
throw new UnsupportedOperationException("Ignored is a placeholder
only");
}
}
```
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