voidbag edited a comment on issue #24779: [SPARK-27929][SQL][WIP] Make 
percentile function receive frq of double
URL: https://github.com/apache/spark/pull/24779#issuecomment-500340705
   1. Benefits
       - This PR makes it possible to calculate percentile (linear 
interpolation over first argument in case of boundary), directly.
       - It's possible to accept frequency argument of double type
       - It's compatible with existing percentile function which used only 
integer as frequency
   2. Work In Progress
       - Its own unittest is not yet implemented
   3. I have executed `dev/scalastyle`
   4. Other db engines don't seem to provide percentile function with 
**frequency**, unlike percentile aggregate function of catalyst package in Spark

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