Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19022#discussion_r134760043
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala
---
@@ -210,4 +210,13 @@ class ExpressionSetSuite extends SparkFunSuite {
assert((initialSet - (aLower + 1)).size == 0)
}
+
+ test("add multiple elements to set") {
--- End diff --
Yap, previous `++` works without problem. The override version goes to
reduce the time cost. This test is just used to make sure we don't mess up
behavior of `++`.
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