Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13045#discussion_r63991309
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -37,6 +38,14 @@ private[sql] object Column {
def apply(expr: Expression): Column = new Column(expr)
def unapply(col: Column): Option[Expression] = Some(col.expr)
+
+ private[sql] def generateAlias(e: Expression, index: Int): String = {
+ e match {
+ case a: AggregateExpression if
a.aggregateFunction.isInstanceOf[TypedAggregateExpression] =>
+ s"${a.aggregateFunction.prettyName}_c${index}"
--- End diff --
how about `aggregateFunction.toString`? It carries more information and not
that verbose.
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