cloud-fan commented on code in PR #45036:
URL: https://github.com/apache/spark/pull/45036#discussion_r1480904118
##########
core/src/test/scala/org/apache/spark/util/collection/OpenHashSetSuite.scala:
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@@ -269,4 +269,35 @@ class OpenHashSetSuite extends SparkFunSuite with Matchers
{
assert(pos1 == pos2)
}
}
+
+ test("SPARK-45599: 0.0 and -0.0 are equal but not the same") {
Review Comment:
This is a bit tricky and it's better if we can find a reference system that
defines this semantic. In Spark, `0.0 == -0.0`, and in GROUP BY, 0.0 and -0.0
are considered to be in the same group and normalized to 0.0.
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