Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21133#discussion_r184866940
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/ApproximatePercentile.scala
---
@@ -238,12 +238,6 @@ object ApproximatePercentile {
summaries = summaries.insert(value)
// The result of QuantileSummaries.insert is un-compressed
isCompressed = false
--- End diff --
I think so, since we still compress in many places: in `merge`,
`getPercentiles` and in `quantileSummaries`.
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