uros-db commented on code in PR #56891:
URL: https://github.com/apache/spark/pull/56891#discussion_r3528838573
##########
sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala:
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@@ -132,6 +132,17 @@ class DataFrameAggregateSuite extends SharedSparkSession
)
}
+ test("cube()/rollup() with no grouping columns return one grand-total row
over empty input") {
+ // With no grouping columns, cube()/rollup() lower to a global aggregate
(the grand total),
+ // which returns one row even over empty input -- like an aggregation with
no GROUP BY clause.
+ // This is the DataFrame-API surface for the empty CUBE/ROLLUP case (not
expressible in SQL).
+ checkAnswer(spark.range(0).cube().count(), Row(0L))
Review Comment:
Added to ClientE2ETestSuite (14544d66880); validated by Connect CI since
it's a RemoteSparkSession E2E test.
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