ArnavBalyan opened a new pull request, #7875:
URL: https://github.com/apache/paimon/pull/7875
### Purpose
- Paimon has no IsNaN predicate today, any caller has no way to express it
in Paimon predicate IR
- Add IsNaN as a new LeafUnaryFunction, which can evaluate rows and
pushdown to Parquet for double and float
- ParquetFilters pushes down to Parquet via new UserDefinedPredicate.
### Tests
- UT
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