Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12235#discussion_r58923919
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -333,6 +333,8 @@ case class PrettyAttribute(
}
object VirtualColumn {
- val groupingIdName: String = "grouping__id"
+ // The attribute name used by Hive, which has different result than
Spark, deprecated.
+ val hiveGroupingIdName: String = "grouping__id"
+ val groupingIdName: String = "spark_grouping_id"
--- End diff --
"grouping__id" came from Hive, but unfortunately the implementation is
wrong, see https://issues.apache.org/jira/browse/HIVE-12833. So we deprecated
to favor the standard function grouping_id() as public API. "spark_grouping_id"
is the virtual column only used internally.
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