amanomer commented on issue #26808: [SPARK-30184][SQL] Implement a helper 
method for aliasing functions
URL: https://github.com/apache/spark/pull/26808#issuecomment-563791380
 
 
   > btw, why did you include fixes for Average and ApproximatePercentile in 
this pr?
   
   `Average` and `ApproximatePercentile` can be called with alias name as well.
   
https://github.com/apache/spark/blob/be867e8a9ee8fc5e4831521770f51793e9265550/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L303-L304

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