Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5616#discussion_r29107399
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -89,6 +89,12 @@ abstract class BinaryExpression extends Expression with
trees.BinaryNode[Express
override def toString: String = s"($left $symbol $right)"
}
+abstract class BinaryFunctionExpression extends Expression with
trees.BinaryNode[Expression] {
--- End diff --
can you document what's the difference between BinaryFunctionExpression and
BinaryExpression? Before the addition of this function everything was pretty
self evident.
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