Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/16933#discussion_r101342124 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/CollapseRepartitionSuite.scala --- @@ -32,6 +32,18 @@ class CollapseRepartitionSuite extends PlanTest { val testRelation = LocalRelation('a.int, 'b.int) + + test("collapse two adjacent coalesces into one") { + val query = testRelation + .coalesce(10) + .coalesce(20) --- End diff -- I think it would be better to respect the later input number, which is specified by users, for avoiding any surprise to users.
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