beliefer opened a new pull request #35520:
URL: https://github.com/apache/spark/pull/35520


   ### What changes were proposed in this pull request?
   This PR follows up https://github.com/apache/spark/pull/35166.
   The previously referenced DB2 documentation is incorrect, resulting in the 
lack of compile that supports some aggregate functions.
   
   The correct documentation is 
https://www.ibm.com/docs/en/db2/11.5?topic=af-regression-functions-regr-avgx-regr-avgy-regr-count
   
   
   ### Why are the changes needed?
   Make build-in DB2 dialect support complete aggregate push-down more 
aggregate functions.
   
   
   ### Does this PR introduce _any_ user-facing change?
   'Yes'.
   Users could use complete aggregate push-down with build-in DB2 dialect.
   
   
   ### How was this patch tested?
   New tests.
   


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