Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4592#discussion_r24713035
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala
---
@@ -93,7 +93,14 @@ private[sql] class DataFrameImpl protected[sql](
queryExecution.analyzed.resolve(n.name,
sqlContext.analyzer.resolver).get
}
}
-
+
+ protected[sql] def numericColumns(colNames: String*): Seq[Expression] = {
--- End diff --
i don't think you'd want this. if an user explicitly specifies a column, we
should just throw an error rather than silently dropping the column from
numeric aggregation
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