cloud-fan commented on code in PR #36117:
URL: https://github.com/apache/spark/pull/36117#discussion_r846962060
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sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/EliminateDistinctSuite.scala:
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@@ -71,4 +72,26 @@ class EliminateDistinctSuite extends PlanTest {
comparePlans(Optimize.execute(query), answer)
}
}
+
+ test("SPARK-38832: Remove unnecessary distinct in aggregate expression by
distinctKeys") {
+ val q1 = testRelation2.groupBy($"a")($"a")
+ .rebalance().groupBy()(countDistinct($"a") as "x", sumDistinct($"a") as
"y").analyze
+ val r1 = testRelation2.groupBy($"a")($"a")
+ .rebalance().groupBy()(count($"a") as "x", sum($"a") as "y").analyze
+ comparePlans(Optimize.execute(q1), r1)
+
+ // not a subset of distinct attr
+ val q2 = testRelation2.groupBy($"a", $"b")($"a", $"b")
+ .rebalance().groupBy()(countDistinct($"a") as "x", sumDistinct($"a") as
"y").analyze
+ comparePlans(Optimize.execute(q2), q2)
+
+ // avoid remove double data type attr
Review Comment:
what will go wrong if we optimize this case as well?
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