Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14742#discussion_r121720072
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -389,6 +389,16 @@ class RelationalGroupedDataset protected[sql](
}
/**
+ * Returns all grouping column names as an array.
+ *
+ * @since 2.1.0
+ */
+ def columns: Array[String] = {
+ val groupingNamedExpressions = groupingExprs.map(alias)
--- End diff --
This might not be a column (a named expression). Thus, this might not be
useful to end users.
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