yyanyy opened a new pull request #2069:
URL: https://github.com/apache/iceberg/pull/2069


   This PR is based on the behavior we observed in 
[here](https://github.com/apache/iceberg/blob/master/core/src/test/java/org/apache/iceberg/TestMetrics.java#L362-L417):
   - NaN is always populated as max when present in Parquet, and both max and 
min for ORC if the first row of the file is NaN
   - when lower bound is NaN, upper bound will also always be NaN
   - in Java, NaN is considered to be greater than all numbers in comparison
   
   This fixes #1761. 
   


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