Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21598#discussion_r197618318
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -75,28 +75,47 @@ trait BinaryArrayExpressionWithImplicitCast extends
BinaryExpression
> SELECT _FUNC_(array('b', 'd', 'c', 'a'));
--- End diff --
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