Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4592#discussion_r24731788
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/GroupedData.scala ---
@@ -39,13 +39,14 @@ class GroupedData protected[sql](df: DataFrameImpl,
groupingExprs: Seq[Expressio
df.sqlContext, Aggregate(groupingExprs, namedGroupingExprs ++
aggExprs, df.logicalPlan))
}
- private[this] def aggregateNumericColumns(f: Expression => Expression):
Seq[NamedExpression] = {
- df.numericColumns.map { c =>
- val a = f(c)
- Alias(a, a.toString)()
- }
+ private[this] def aggregateNumericColumns(colNames: String*)
--- End diff --
also the error message can be very confusing when you just say "Cannot
resolve column name" even though the column obviously exist.
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