Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/22013#discussion_r208169969
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/HigherOrderFunctionsSuite.scala
---
@@ -181,4 +187,46 @@ class HigherOrderFunctionsSuite extends SparkFunSuite
with ExpressionEvalHelper
(acc, array) => coalesce(aggregate(array, acc, (acc, elem) => acc
+ elem), acc)),
15)
}
+
+ test("TransformKeys") {
+ val ai0 = Literal.create(
+ Map(1 -> 1, 2 -> 2, 3 -> 3),
--- End diff --
It's maybe irrelevant but WDYT about adding test cases with ```null```
values?
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