ulysses-you commented on a change in pull request #30330:
URL: https://github.com/apache/spark/pull/30330#discussion_r521219561
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Canonicalize.scala
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@@ -109,6 +109,13 @@ object Canonicalize {
// order the list in the In operator
case In(value, list) if list.length > 1 => In(value,
list.sortBy(_.hashCode()))
+ case g: Greatest =>
+ val newChildren = orderCommutative(g, { case Greatest(children) =>
children })
+ Greatest(newChildren)
Review comment:
We can just flatMap the nested `Greatest` to one Greatest.
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