beliefer opened a new pull request #34799:
URL: https://github.com/apache/spark/pull/34799


   ### What changes were proposed in this pull request?
   Currently, Spark aggregate pushdown will translate some standard aggregate 
functions, so that compile these functions to adapt specify database.
   After this job, users could override `JdbcDialect.compileAggregate` to 
implement some aggregate functions supported by some database.
   
   
   ### Why are the changes needed?
   Make the implement of *Dialect could extends the aggregate functions by 
override `JdbcDialect.compileAggregate`.
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes. Users could pushdown more aggregate functions.
   
   
   ### How was this patch tested?
   Exists tests.
   


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