adriangb commented on code in PR #21438:
URL: https://github.com/apache/datafusion/pull/21438#discussion_r3068323367
##########
datafusion/core/tests/dataframe/mod.rs:
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@@ -6852,3 +6852,50 @@ async fn
test_duplicate_state_fields_for_dfschema_construct() -> Result<()> {
Ok(())
}
+
+/// Regression test for https://github.com/apache/datafusion/issues/21411
+/// grouping() should work when wrapped in an alias via the DataFrame API.
+///
+/// This bug only manifests through the DataFrame API because `.alias()` wraps
+/// the `grouping()` call in an `Expr::Alias` node at the aggregate expression
+/// level. The SQL planner handles aliasing separately (via projection), so the
+/// `ResolveGroupingFunction` analyzer rule never sees an `Expr::Alias` wrapper
+/// around the aggregate function in SQL queries — making SQL-based tests
+/// insufficient to cover this case.
+#[tokio::test]
+async fn test_grouping_with_alias() -> Result<()> {
Review Comment:
I confirmed this test fails on main.
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