Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17099#discussion_r103501851
--- Diff: sql/core/src/test/resources/sql-tests/inputs/inner-join.sql ---
@@ -0,0 +1,25 @@
+CREATE TEMPORARY VIEW t1 AS SELECT * FROM VALUES (1) AS GROUPING(a);
+CREATE TEMPORARY VIEW t2 AS SELECT * FROM VALUES (1) AS GROUPING(a);
+CREATE TEMPORARY VIEW t3 AS SELECT * FROM VALUES (1), (1) AS GROUPING(a);
+CREATE TEMPORARY VIEW t4 AS SELECT * FROM VALUES (1), (1) AS GROUPING(a);
+
+CREATE TEMPORARY VIEW ta AS
+SELECT a, 'a' AS tag FROM t1
+UNION ALL
+SELECT a, 'b' AS tag FROM t2;
+
+CREATE TEMPORARY VIEW tb AS
+SELECT a, 'a' AS tag FROM t3
+UNION ALL
+SELECT a, 'b' AS tag FROM t4;
+
+-- SPARK-19766 Constant alias columns in INNER JOIN should not be folded
by FoldablePropagation rule
+SELECT tb.* FROM ta INNER JOIN tb ON ta.a = tb.a AND ta.tag = tb.tag;
+
+-- Clean up
+DROP VIEW IF EXISTS t1;
--- End diff --
i don't think you need these drop views, since TEMPORARY VIEW are destroyed
immediately after this file.
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