zzcclp commented on a change in pull request #31404:
URL: https://github.com/apache/spark/pull/31404#discussion_r575769521
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File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameSetOperationsSuite.scala
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@@ -385,6 +385,90 @@ class DataFrameSetOperationsSuite extends QueryTest with
SharedSparkSession {
checkAnswer(unionDF, unionAllDF)
}
+ test("SQL-style union using Dataset: remove unnecessary deduplicate in
multiple unions") {
+ val unionDF =
testData.union(testData).distinct().union(testData).distinct()
+ .union(testData).distinct().union(testData).distinct()
+
+ // Before optimizer, there are three 'union.deduplicate' operations should
be combined.
+ assert(unionDF.queryExecution.analyzed.collect {
+ case j: Union if j.children.size == 4 => j
+ }.size === 1)
+
+ // After optimizer, four 'union.deduplicate' operations should be combined.
+ assert(unionDF.queryExecution.optimizedPlan.collect {
+ case j: Union if j.children.size == 5 => j
+ }.size === 1)
+
+ checkAnswer(
+ unionDF.agg(avg("key"), max("key"), min("key"), sum("key")),
+ Row(50.5, 100, 1, 5050) :: Nil
+ )
+
+ // The result of SQL-style union
+ val unionSQLResult = sql(
+ """
+ | select key, value from testData
+ | union
+ | select key, value from testData
+ | union
+ | select key, value from testData
+ | union
+ | select key, value from testData
+ | union
+ | select key, value from testData
+ |""".stripMargin)
+ checkAnswer(unionDF, unionSQLResult)
Review comment:
The purpose is to check whether the results between Dataset-style and
SQL-Style are the same.
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