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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