Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r178700701
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -287,3 +289,166 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+
+/**
+ * Replaces [[org.apache.spark.sql.catalyst.analysis.UnresolvedConcat
UnresolvedConcat]]s
+ * with concrete concate expressions.
+ */
+object ResolveConcat
+{
--- End diff --
nit: `object ResolveConcat {`
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