Github user henryr commented on a diff in the pull request:
https://github.com/apache/spark/pull/21072#discussion_r181851593
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -736,12 +736,22 @@ object EliminateSorts extends Rule[LogicalPlan] {
}
/**
- * Removes Sort operation if the child is already sorted
+ * Removes redundant Sort operation. This can happen:
+ * 1) if the child is already sorted
+ * 2) if the there is another Sort operator separated by 0...n
Project/Filter operators
--- End diff --
nit: 'the there'
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