panbingkun commented on PR #41984:
URL: https://github.com/apache/spark/pull/41984#issuecomment-1634069791

   No further others similar case have been found so far,
   
   Also, I would like to use this place to discuss some question:
   
   - In 
[FunctionRegistry](https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L300),
 the classification of some functions is incorrect, is it worth doing? eg:
   
   
https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L357-L363
   
   Obviously, the function `Abs` belongs to 
https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L384-L388
   
   - Do we need to align the classification of functions in scala with that in 
Python? eg: `EqualNull`
   In scala, it belongs to `Misc Function`
   
https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala#L1114-L1117
   
https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L721-L748
   
   In python, it belongs to `Predicate Functions`
   
https://github.com/apache/spark/blob/8bb07388ea664303d0d22b03cca11a46498b772d/python/docs/source/reference/pyspark.sql/functions.rst?plain=1#L514-L520


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