Github user damiencarol commented on a diff in the pull request: https://github.com/apache/spark/pull/5919#discussion_r29712214 --- 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 => if ???
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