Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/16371#discussion_r93388333
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Percentile.scala
---
@@ -33,10 +33,9 @@ import org.apache.spark.util.collection.OpenHashMap
* The Percentile aggregate function returns the exact percentile(s) of
numeric column `expr` at
* the given percentage(s) with value range in [0.0, 1.0].
*
- * The operator is bound to the slower sort based aggregation path because
the number of elements
--- End diff --
`TypedImperativeAggregate` is't bound to sort based aggregation.
`ObjectHashAggregateExec` supports `TypedImperativeAggregate` in hash based
aggregation now.
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