davidlghellin opened a new pull request, #18576:
URL: https://github.com/apache/datafusion/pull/18576

   ## Which issue does this PR close?
   
   part of https://github.com/apache/datafusion/issues/15914
   
   ## Rationale for this change
   
   Migrate spark functions from https://github.com/lakehq/sail/ to datafusion 
engine to unify codebase
   
   ## What changes are included in this PR?
   
   implement spark udaf try_avg
   https://spark.apache.org/docs/latest/api/sql/index.html#try_avg
   
   ## Are these changes tested?
   
   unit-tests and sqllogictests added
   
   ## Are there any user-facing changes?
   
   now can be called in queries
   


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