beliefer opened a new pull request #35248:
URL: https://github.com/apache/spark/pull/35248


   ### What changes were proposed in this pull request?
   Currently, Spark supports aggregate push down `SUM(column)` into JDBC data 
source.
   `SUM(CASE ... WHEN ... ELSE ... END)` is very useful for users.
   case when could help users to finish many works.
   
   
   ### Why are the changes needed?
   Support push down `SUM(CASE ... WHEN ... ELSE ... END)`
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes. Users could use `SUM(CASE ... WHEN ... ELSE ... END)` with aggregate 
push down.
   
   
   ### How was this patch tested?
   New tests.
   


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