Add a test case

h2/src/test/org/h2/test/scripts/dml/mergeUsing.sql

@@ -114,3 +114,38 @@ DROP TABLE SOURCE_TABLE;
 
 DROP TABLE DEST_TABLE;
 > ok
+
+CREATE TABLE TEST(C1 INT, C2 INT, C3 INT);
+> ok
+
+MERGE INTO TEST USING DUAL ON (C1 = 11 AND C2 = 21)
+    WHEN NOT MATCHED THEN INSERT (C1, C2, C3) VALUES (11, 21, 31)
+    WHEN MATCHED THEN UPDATE SET C3 = 31;
+> update count: 1
+
+MERGE INTO TEST USING DUAL ON (C1 = 11 AND C2 = 22)
+    WHEN NOT MATCHED THEN INSERT (C1, C2, C3) VALUES (11, 22, 32)
+    WHEN MATCHED THEN UPDATE SET C3 = 32;
+> update count: 1
+
+SELECT * FROM TEST ORDER BY C1, C2;
+> C1 C2 C3
+> -- -- --
+> 11 21 31
+> 11 22 32
+> rows (ordered): 2
+
+MERGE INTO TEST USING DUAL ON (C1 = 11 AND C2 = 21)
+    WHEN NOT MATCHED THEN INSERT (C1, C2, C3) VALUES (11, 21, 33)
+    WHEN MATCHED THEN UPDATE SET C3 = 33;
+> update count: 1
+
+SELECT * FROM TEST ORDER BY C1, C2;
+> C1 C2 C3
+> -- -- --
+> 11 21 33
+> 11 22 32
+> rows (ordered): 2
+
+DROP TABLE TEST;
+> ok