Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5919#discussion_r29713542
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -171,6 +171,11 @@ case class AttributeReference(
val exprId: ExprId = NamedExpression.newExprId,
val qualifiers: Seq[String] = Nil) extends Attribute with
trees.LeafNode[Expression] {
+ /**
+ * Returns true iff the expression id is the same for both attributes.
--- End diff --
`iff` is [a pretty standard
shortening](http://en.wikipedia.org/wiki/If_and_only_if) and is used
[throughout the spark code base
already](https://github.com/apache/spark/search?utf8=%E2%9C%93&q=iff).
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