Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/21824
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Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21824#discussion_r203953613
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
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@@ -2322,49 +2369,53 @@ case class
GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/21824
[SPARK-24871][SQL] Refactor Concat and MapConcat to avoid creating
concatenator object for each row.
## What changes were proposed in this pull request?
Refactor `Concat` and `MapConcat`
