Github user tejasapatil commented on a diff in the pull request: https://github.com/apache/spark/pull/14841#discussion_r77113690 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala --- @@ -61,6 +61,9 @@ case class SortOrder(child: Expression, direction: SortDirection) override def sql: String = child.sql + " " + direction.sql def isAscending: Boolean = direction == Ascending + + def semanticEquals(other: SortOrder): Boolean = --- End diff -- @cloud-fan : If you look at the old version of `EnsureRequirements` below at L253, it compared raw `SortOrder` objects which will use `equals()` generated for it. In scala, `equals()` for case classes is merely doing `equals()` over all its fields so that lead to `Expression`'s `equals()` being used instead of its `semanticEquals()`. My fix here was to introduce a `semanticEquals` in `SortOrder` which compares the underlying `Expression` semantically.
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