1 files changed, 357 insertions, 0 deletions
diff --git a/src/test/regress/sql/fast_default.sql b/src/test/regress/sql/fast_default.sql
new file mode 100644
index 00000000000..6a3f9b367e4
--- /dev/null
+++ b/src/test/regress/sql/fast_default.sql
@@ -0,0 +1,357 @@
+--
+-- ALTER TABLE ADD COLUMN DEFAULT test
+--
+
+SET search_path = fast_default;
+CREATE SCHEMA fast_default;
+CREATE TABLE m(id OID);
+INSERT INTO m VALUES (NULL::OID);
+
+CREATE FUNCTION set(tabname name) RETURNS VOID
+AS $$
+BEGIN
+  UPDATE m
+  SET id = (SELECT c.relfilenode
+            FROM pg_class AS c, pg_namespace AS s
+            WHERE c.relname = tabname
+                AND c.relnamespace = s.oid
+                AND s.nspname = 'fast_default');
+END;
+$$ LANGUAGE 'plpgsql';
+
+CREATE FUNCTION comp() RETURNS TEXT
+AS $$
+BEGIN
+  RETURN (SELECT CASE
+               WHEN m.id = c.relfilenode THEN 'Unchanged'
+               ELSE 'Rewritten'
+               END
+           FROM m, pg_class AS c, pg_namespace AS s
+           WHERE c.relname = 't'
+               AND c.relnamespace = s.oid
+               AND s.nspname = 'fast_default');
+END;
+$$ LANGUAGE 'plpgsql';
+
+CREATE FUNCTION log_rewrite() RETURNS event_trigger
+LANGUAGE plpgsql as
+$func$
+
+declare
+   this_schema text;
+begin
+    select into this_schema relnamespace::regnamespace::text
+    from pg_class
+    where oid = pg_event_trigger_table_rewrite_oid();
+    if this_schema = 'fast_default'
+    then
+        RAISE NOTICE 'rewriting table % for reason %',
+          pg_event_trigger_table_rewrite_oid()::regclass,
+          pg_event_trigger_table_rewrite_reason();
+    end if;
+end;
+$func$;
+
+CREATE TABLE has_volatile AS
+SELECT * FROM generate_series(1,10) id;
+
+
+CREATE EVENT TRIGGER has_volatile_rewrite
+                  ON table_rewrite
+   EXECUTE PROCEDURE log_rewrite();
+
+-- only the last of these should trigger a rewrite
+ALTER TABLE has_volatile ADD col1 int;
+ALTER TABLE has_volatile ADD col2 int DEFAULT 1;
+ALTER TABLE has_volatile ADD col3 timestamptz DEFAULT current_timestamp;
+ALTER TABLE has_volatile ADD col4 int DEFAULT (random() * 10000)::int;
+
+
+
+-- Test a large sample of different datatypes
+CREATE TABLE T(pk INT NOT NULL PRIMARY KEY, c_int INT DEFAULT 1);
+
+SELECT set('t');
+
+INSERT INTO T VALUES (1), (2);
+
+ALTER TABLE T ADD COLUMN c_bpchar BPCHAR(5) DEFAULT 'hello',
+              ALTER COLUMN c_int SET DEFAULT 2;
+
+INSERT INTO T VALUES (3), (4);
+
+
+ALTER TABLE T ADD COLUMN c_text TEXT  DEFAULT 'world',
+              ALTER COLUMN c_bpchar SET DEFAULT 'dog';
+
+INSERT INTO T VALUES (5), (6);
+
+ALTER TABLE T ADD COLUMN c_date DATE DEFAULT '2016-06-02',
+              ALTER COLUMN c_text SET DEFAULT 'cat';
+
+INSERT INTO T VALUES (7), (8);
+
+ALTER TABLE T ADD COLUMN c_timestamp TIMESTAMP DEFAULT '2016-09-01 12:00:00',
+              ADD COLUMN c_timestamp_null TIMESTAMP,
+              ALTER COLUMN c_date SET DEFAULT '2010-01-01';
+
+INSERT INTO T VALUES (9), (10);
+
+ALTER TABLE T ADD COLUMN c_array TEXT[]
+                  DEFAULT '{"This", "is", "the", "real", "world"}',
+              ALTER COLUMN c_timestamp SET DEFAULT '1970-12-31 11:12:13',
+              ALTER COLUMN c_timestamp_null SET DEFAULT '2016-09-29 12:00:00';
+
+INSERT INTO T VALUES (11), (12);
+
+ALTER TABLE T ADD COLUMN c_small SMALLINT DEFAULT -5,
+              ADD COLUMN c_small_null SMALLINT,
+              ALTER COLUMN c_array
+                  SET DEFAULT '{"This", "is", "no", "fantasy"}';
+
+INSERT INTO T VALUES (13), (14);
+
+ALTER TABLE T ADD COLUMN c_big BIGINT DEFAULT 180000000000018,
+              ALTER COLUMN c_small SET DEFAULT 9,
+              ALTER COLUMN c_small_null SET DEFAULT 13;
+
+INSERT INTO T VALUES (15), (16);
+
+ALTER TABLE T ADD COLUMN c_num NUMERIC DEFAULT 1.00000000001,
+              ALTER COLUMN c_big SET DEFAULT -9999999999999999;
+
+INSERT INTO T VALUES (17), (18);
+
+ALTER TABLE T ADD COLUMN c_time TIME DEFAULT '12:00:00',
+              ALTER COLUMN c_num SET DEFAULT 2.000000000000002;
+
+INSERT INTO T VALUES (19), (20);
+
+ALTER TABLE T ADD COLUMN c_interval INTERVAL DEFAULT '1 day',
+              ALTER COLUMN c_time SET DEFAULT '23:59:59';
+
+INSERT INTO T VALUES (21), (22);
+
+ALTER TABLE T ADD COLUMN c_hugetext TEXT DEFAULT repeat('abcdefg',1000),
+              ALTER COLUMN c_interval SET DEFAULT '3 hours';
+
+INSERT INTO T VALUES (23), (24);
+
+ALTER TABLE T ALTER COLUMN c_interval DROP DEFAULT,
+              ALTER COLUMN c_hugetext SET DEFAULT repeat('poiuyt', 1000);
+
+INSERT INTO T VALUES (25), (26);
+
+ALTER TABLE T ALTER COLUMN c_bpchar    DROP DEFAULT,
+              ALTER COLUMN c_date      DROP DEFAULT,
+              ALTER COLUMN c_text      DROP DEFAULT,
+              ALTER COLUMN c_timestamp DROP DEFAULT,
+              ALTER COLUMN c_array     DROP DEFAULT,
+              ALTER COLUMN c_small     DROP DEFAULT,
+              ALTER COLUMN c_big       DROP DEFAULT,
+              ALTER COLUMN c_num       DROP DEFAULT,
+              ALTER COLUMN c_time      DROP DEFAULT,
+              ALTER COLUMN c_hugetext  DROP DEFAULT;
+
+INSERT INTO T VALUES (27), (28);
+
+SELECT pk, c_int, c_bpchar, c_text, c_date, c_timestamp,
+       c_timestamp_null, c_array, c_small, c_small_null,
+       c_big, c_num, c_time, c_interval,
+       c_hugetext = repeat('abcdefg',1000) as c_hugetext_origdef,
+       c_hugetext = repeat('poiuyt', 1000) as c_hugetext_newdef
+FROM T ORDER BY pk;
+
+SELECT comp();
+
+DROP TABLE T;
+
+-- Test expressions in the defaults
+CREATE OR REPLACE FUNCTION foo(a INT) RETURNS TEXT AS $$
+DECLARE res TEXT := '';
+        i INT;
+BEGIN
+  i := 0;
+  WHILE (i < a) LOOP
+    res := res || chr(ascii('a') + i);
+    i := i + 1;
+  END LOOP;
+  RETURN res;
+END; $$ LANGUAGE PLPGSQL STABLE;
+
+CREATE TABLE T(pk INT NOT NULL PRIMARY KEY, c_int INT DEFAULT LENGTH(foo(6)));
+
+SELECT set('t');
+
+INSERT INTO T VALUES (1), (2);
+
+ALTER TABLE T ADD COLUMN c_bpchar BPCHAR(5) DEFAULT foo(4),
+              ALTER COLUMN c_int SET DEFAULT LENGTH(foo(8));
+
+INSERT INTO T VALUES (3), (4);
+
+ALTER TABLE T ADD COLUMN c_text TEXT  DEFAULT foo(6),
+              ALTER COLUMN c_bpchar SET DEFAULT foo(3);
+
+INSERT INTO T VALUES (5), (6);
+
+ALTER TABLE T ADD COLUMN c_date DATE
+                  DEFAULT '2016-06-02'::DATE  + LENGTH(foo(10)),
+              ALTER COLUMN c_text SET DEFAULT foo(12);
+
+INSERT INTO T VALUES (7), (8);
+
+ALTER TABLE T ADD COLUMN c_timestamp TIMESTAMP
+                  DEFAULT '2016-09-01'::DATE + LENGTH(foo(10)),
+              ALTER COLUMN c_date
+                  SET DEFAULT '2010-01-01'::DATE - LENGTH(foo(4));
+
+INSERT INTO T VALUES (9), (10);
+
+ALTER TABLE T ADD COLUMN c_array TEXT[]
+                  DEFAULT ('{"This", "is", "' || foo(4) ||
+                           '","the", "real", "world"}')::TEXT[],
+              ALTER COLUMN c_timestamp
+                  SET DEFAULT '1970-12-31'::DATE + LENGTH(foo(30));
+
+INSERT INTO T VALUES (11), (12);
+
+ALTER TABLE T ALTER COLUMN c_int DROP DEFAULT,
+              ALTER COLUMN c_array
+                  SET DEFAULT ('{"This", "is", "' || foo(1) ||
+                               '", "fantasy"}')::text[];
+
+INSERT INTO T VALUES (13), (14);
+
+ALTER TABLE T ALTER COLUMN c_bpchar    DROP DEFAULT,
+              ALTER COLUMN c_date      DROP DEFAULT,
+              ALTER COLUMN c_text      DROP DEFAULT,
+              ALTER COLUMN c_timestamp DROP DEFAULT,
+              ALTER COLUMN c_array     DROP DEFAULT;
+
+INSERT INTO T VALUES (15), (16);
+
+SELECT * FROM T;
+
+SELECT comp();
+
+DROP TABLE T;
+
+DROP FUNCTION foo(INT);
+
+-- Fall back to full rewrite for volatile expressions
+CREATE TABLE T(pk INT NOT NULL PRIMARY KEY);
+
+INSERT INTO T VALUES (1);
+
+SELECT set('t');
+
+-- now() is stable, because it returns the transaction timestamp
+ALTER TABLE T ADD COLUMN c1 TIMESTAMP DEFAULT now();
+
+SELECT comp();
+
+-- clock_timestamp() is volatile
+ALTER TABLE T ADD COLUMN c2 TIMESTAMP DEFAULT clock_timestamp();
+
+SELECT comp();
+
+DROP TABLE T;
+
+-- Simple querie
+CREATE TABLE T (pk INT NOT NULL PRIMARY KEY);
+
+SELECT set('t');
+
+INSERT INTO T SELECT * FROM generate_series(1, 10) a;
+
+ALTER TABLE T ADD COLUMN c_bigint BIGINT NOT NULL DEFAULT -1;
+
+INSERT INTO T SELECT b, b - 10 FROM generate_series(11, 20) a(b);
+
+ALTER TABLE T ADD COLUMN c_text TEXT DEFAULT 'hello';
+
+INSERT INTO T SELECT b, b - 10, (b + 10)::text FROM generate_series(21, 30) a(b);
+
+-- WHERE clause
+SELECT c_bigint, c_text FROM T WHERE c_bigint = -1 LIMIT 1;
+
+EXPLAIN (VERBOSE TRUE, COSTS FALSE)
+SELECT c_bigint, c_text FROM T WHERE c_bigint = -1 LIMIT 1;
+
+SELECT c_bigint, c_text FROM T WHERE c_text = 'hello' LIMIT 1;
+
+EXPLAIN (VERBOSE TRUE, COSTS FALSE) SELECT c_bigint, c_text FROM T WHERE c_text = 'hello' LIMIT 1;
+
+
+-- COALESCE
+SELECT COALESCE(c_bigint, pk), COALESCE(c_text, pk::text)
+FROM T
+ORDER BY pk LIMIT 10;
+
+-- Aggregate function
+SELECT SUM(c_bigint), MAX(c_text), MIN(c_text) FROM T;
+
+-- ORDER BY
+SELECT * FROM T ORDER BY c_bigint, c_text, pk LIMIT 10;
+
+EXPLAIN (VERBOSE TRUE, COSTS FALSE)
+SELECT * FROM T ORDER BY c_bigint, c_text, pk LIMIT 10;
+
+-- LIMIT
+SELECT * FROM T WHERE c_bigint > -1 ORDER BY c_bigint, c_text, pk LIMIT 10;
+
+EXPLAIN (VERBOSE TRUE, COSTS FALSE)
+SELECT * FROM T WHERE c_bigint > -1 ORDER BY c_bigint, c_text, pk LIMIT 10;
+
+--  DELETE with RETURNING
+DELETE FROM T WHERE pk BETWEEN 10 AND 20 RETURNING *;
+EXPLAIN (VERBOSE TRUE, COSTS FALSE)
+DELETE FROM T WHERE pk BETWEEN 10 AND 20 RETURNING *;
+
+-- UPDATE
+UPDATE T SET c_text = '"' || c_text || '"'  WHERE pk < 10;
+SELECT * FROM T WHERE c_text LIKE '"%"' ORDER BY PK;
+
+SELECT comp();
+
+DROP TABLE T;
+
+
+-- Combine with other DDL
+CREATE TABLE T(pk INT NOT NULL PRIMARY KEY);
+
+SELECT set('t');
+
+INSERT INTO T VALUES (1), (2);
+
+ALTER TABLE T ADD COLUMN c_int INT NOT NULL DEFAULT -1;
+
+INSERT INTO T VALUES (3), (4);
+
+ALTER TABLE T ADD COLUMN c_text TEXT DEFAULT 'Hello';
+
+INSERT INTO T VALUES (5), (6);
+
+ALTER TABLE T ALTER COLUMN c_text SET DEFAULT 'world',
+              ALTER COLUMN c_int  SET DEFAULT 1;
+
+INSERT INTO T VALUES (7), (8);
+
+SELECT * FROM T ORDER BY pk;
+
+-- Add an index
+CREATE INDEX i ON T(c_int, c_text);
+
+SELECT c_text FROM T WHERE c_int = -1;
+
+SELECT comp();
+
+DROP TABLE T;
+DROP FUNCTION set(name);
+DROP FUNCTION comp();
+DROP TABLE m;
+DROP TABLE has_volatile;
+DROP EVENT TRIGGER has_volatile_rewrite;
+DROP FUNCTION log_rewrite;
+DROP SCHEMA fast_default;