viirya commented on a change in pull request #34025:
URL: https://github.com/apache/spark/pull/34025#discussion_r710528051
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameSetOperationsSuite.scala
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@@ -1018,6 +1018,23 @@ class DataFrameSetOperationsSuite extends QueryTest with
SharedSparkSession {
unionDF = df1.unionByName(df2)
checkAnswer(unionDF, expected)
}
+
+ test("SPARK-36673: Incorrect Unions of struct") {
Review comment:
From the JIRA description, this is not with incorrect `nullability` but
incorrect merged schema for union.
For example, the added test case should have only one column in the nested
struct after union, but currently we got 2 columns.
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