1 files changed, 50 insertions, 0 deletions
diff --git a/src/test/regress/sql/select_having.sql b/src/test/regress/sql/select_having.sql
new file mode 100644
index 0000000..bc0cdc0
--- /dev/null
+++ b/src/test/regress/sql/select_having.sql
@@ -0,0 +1,50 @@
+--
+-- SELECT_HAVING
+--
+
+-- load test data
+CREATE TABLE test_having (a int, b int, c char(8), d char);
+INSERT INTO test_having VALUES (0, 1, 'XXXX', 'A');
+INSERT INTO test_having VALUES (1, 2, 'AAAA', 'b');
+INSERT INTO test_having VALUES (2, 2, 'AAAA', 'c');
+INSERT INTO test_having VALUES (3, 3, 'BBBB', 'D');
+INSERT INTO test_having VALUES (4, 3, 'BBBB', 'e');
+INSERT INTO test_having VALUES (5, 3, 'bbbb', 'F');
+INSERT INTO test_having VALUES (6, 4, 'cccc', 'g');
+INSERT INTO test_having VALUES (7, 4, 'cccc', 'h');
+INSERT INTO test_having VALUES (8, 4, 'CCCC', 'I');
+INSERT INTO test_having VALUES (9, 4, 'CCCC', 'j');
+
+SELECT b, c FROM test_having
+	GROUP BY b, c HAVING count(*) = 1 ORDER BY b, c;
+
+-- HAVING is effectively equivalent to WHERE in this case
+SELECT b, c FROM test_having
+	GROUP BY b, c HAVING b = 3 ORDER BY b, c;
+
+SELECT lower(c), count(c) FROM test_having
+	GROUP BY lower(c) HAVING count(*) > 2 OR min(a) = max(a)
+	ORDER BY lower(c);
+
+SELECT c, max(a) FROM test_having
+	GROUP BY c HAVING count(*) > 2 OR min(a) = max(a)
+	ORDER BY c;
+
+-- test degenerate cases involving HAVING without GROUP BY
+-- Per SQL spec, these should generate 0 or 1 row, even without aggregates
+
+SELECT min(a), max(a) FROM test_having HAVING min(a) = max(a);
+SELECT min(a), max(a) FROM test_having HAVING min(a) < max(a);
+
+-- errors: ungrouped column references
+SELECT a FROM test_having HAVING min(a) < max(a);
+SELECT 1 AS one FROM test_having HAVING a > 1;
+
+-- the really degenerate case: need not scan table at all
+SELECT 1 AS one FROM test_having HAVING 1 > 2;
+SELECT 1 AS one FROM test_having HAVING 1 < 2;
+
+-- and just to prove that we aren't scanning the table:
+SELECT 1 AS one FROM test_having WHERE 1/a = 1 HAVING 1 < 2;
+
+DROP TABLE test_having;