Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16371#discussion_r93680880
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala
---
@@ -29,12 +30,10 @@ import org.apache.spark.sql.types._
/**
* The Collect aggregate function collects all seen expression values into
a list of values.
*
- * The operator is bound to the slower sort based aggregation path because
the number of
- * elements (and their memory usage) can not be determined in advance.
This also means that the
- * collected elements are stored on heap, and that too many elements can
cause GC pauses and
- * eventually Out of Memory Errors.
+ * We have to store all the collected elements in memory, and that too
many elements can cause GC
+ * paused and eventually OutOfMemory Errors.
*/
-abstract class Collect extends ImperativeAggregate {
+abstract class Collect[T] extends TypedImperativeAggregate[T] {
--- End diff --
If we can do that, we can make the PR smaller.
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