erikerlandson commented on issue #25024: [SPARK-27296][SQL] User Defined 
Aggregators that do not ser/de on each input row
URL: https://github.com/apache/spark/pull/25024#issuecomment-509418156
 
 
   With respect to the redundancy of UDAF, and UDIA, I would actually propose a 
deprecation path for the existing UDAF. The alternative proposed on this PR has 
behavior parity. 
   
   It could use a story for Java, presumably something like `UDIA[AnyRef]`, or 
`UDIA[Object]`
   
   When using a final presentation type using a UDT, it ought to work via 
pyspark exactly the same as UDAF.
   

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