Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15595#discussion_r84590334
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala
---
@@ -377,4 +377,14 @@ class AnalysisSuite extends AnalysisTest {
assertExpressionType(sum(Divide(Decimal(1), 2.0)), DoubleType)
assertExpressionType(sum(Divide(1.0, Decimal(2.0))), DoubleType)
}
+
+
+ test("SPARK-18058: union operations shall not care about the nullability
of columns") {
--- End diff --
+1 (actually, it'd be nicer if it has unit test and end-to-end test).
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