Github user vlyubin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4988#discussion_r26274859
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -59,6 +59,13 @@ class Column(protected[sql] val expr: Expression) {
override def toString: String = expr.prettyString
+ override def equals(that: Any) = that match {
+ case that: Column => that.expr.equals(this.expr)
+ case _ => false
+ }
+
+ override def hashCode: Int = this.toString.hashCode
--- End diff --
I does. Switched to use that.
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