Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17191#discussion_r106814663
--- Diff: sql/core/src/test/resources/sql-tests/inputs/group-by.sql ---
@@ -35,3 +35,6 @@ FROM testData;
-- Aggregate with foldable input and multiple distinct groups.
SELECT COUNT(DISTINCT b), COUNT(DISTINCT b, c) FROM (SELECT 1 AS a, 2 AS
b, 3 AS c) GROUP BY a;
+
+-- Aliases in SELECT could be used in GROUP BY
+SELECT a AS k, COUNT(b) FROM testData GROUP BY k;
--- End diff --
Also add the extra EXPLAIN for us to know whether the plan is correct.
```
EXPLAIN SELECT a AS k, COUNT(b) FROM testData GROUP BY k
```
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