Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/482#discussion_r12123835
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -239,6 +243,11 @@ abstract class LeafExpression extends Expression with
trees.LeafNode[Expression]
self: Product =>
}
+/**
+ * Root class for rewritten single operand UDF expression. By default, we
assume it produces Null
+ * if its operand is null. Exceptional case requires to update the
optimization rule
+ * at [[optimizer.ConstantFolding ConstantFolding]]
+ */
abstract class UnaryExpression extends Expression with
trees.UnaryNode[Expression] {
--- End diff --
Same concerns as above.
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