Github user tejasapatil commented on a diff in the pull request: https://github.com/apache/spark/pull/15595#discussion_r84600424 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala --- @@ -377,4 +377,23 @@ 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 and set operations shall not care about the nullability" + + " when comparing column types") { + val firstTable = LocalRelation( + AttributeReference("a", + StructType(Seq(StructField("a", IntegerType, nullable = true))), nullable = false)()) + val secondTable = LocalRelation( + AttributeReference("a", + StructType(Seq(StructField("a", IntegerType, nullable = false))), nullable = false)()) + + val unionPlan = Union(firstTable, secondTable) + assertAnalysisSuccess(unionPlan) + + val r1 = Except(firstTable, secondTable) --- End diff -- nit: this var could have been named better. Actually, you could have gotten rid of the vars by doing : ``` assertAnalysisSuccess(Union(firstTable, secondTable)) assertAnalysisSuccess(Except(firstTable, secondTable)) assertAnalysisSuccess(Intersect(firstTable, secondTable)) ```
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