viirya commented on a change in pull request #31404:
URL: https://github.com/apache/spark/pull/31404#discussion_r574091302
##########
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") {
Review comment:
ditto.
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