Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21073#discussion_r184452750
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala
---
@@ -56,6 +58,28 @@ class CollectionExpressionsSuite extends SparkFunSuite
with ExpressionEvalHelper
checkEvaluation(MapValues(m2), null)
}
+ test("Map Concat") {
--- End diff --
Please add more test cases with `null` values.
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