srowen commented on a change in pull request #34474:
URL: https://github.com/apache/spark/pull/34474#discussion_r742400130
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/ApproximatePercentile.scala
##########
@@ -226,7 +226,7 @@ object ApproximatePercentile {
*
* @param summaries underlying probabilistic data structure
[[QuantileSummaries]].
*/
- class PercentileDigest(private var summaries: QuantileSummaries) {
+ class PercentileDigest(private var summaries: QuantileSummaries) extends
Serializable {
Review comment:
I agree if that's possible - I couldn't tell if this was something
observe() should never have to pull back and does accidentally, or whether it
is necessary to return metrics about percentile_approx somehow
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