Timm0 commented on PR #28979:
URL: https://github.com/apache/flink/pull/28979#issuecomment-6214540577

   Hey @MattBelle @dianfu I was having a look here and wondering why he have 
added `isNotNan` additionally to `isNan`? I think `isNan` is useful and I can 
see that probably in a lot of cases `isNotNan` will be used, but I'm a bit torn 
here between offering `isNotNan` or settling only on one function which can 
still serve the use case like `NOT IS_NAN` or `not(isNan(...))`. What are your 
opinions on this?


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