bart-samwel commented on a change in pull request #27991:
URL: https://github.com/apache/spark/pull/27991#discussion_r413816185
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala
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@@ -1532,6 +1532,13 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSparkSession {
assert(e.getMessage.contains("string, binary or array"))
}
+ test("SPARK-31227: Non-nullable null type should not coerce to nullable type
in concat") {
Review comment:
Only that it should be tested, since it's an interesting corner case!
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