database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-13 07:41:39 +03:00
Code Activity

Directly modify foreign tables.

Browse Source 
postgres_fdw can now sent an UPDATE or DELETE statement directly to
the foreign server in simple cases, rather than sending a SELECT FOR
UPDATE statement and then updating or deleting rows one-by-one.

Etsuro Fujita, reviewed by Rushabh Lathia, Shigeru Hanada, Kyotaro
Horiguchi, Albe Laurenz, Thom Brown, and me.
This commit is contained in:
Robert Haas
2016-03-18 13:48:58 -04:00
parent 3422feccca
commit 0bf3ae88af
21 changed files with 1515 additions and 125 deletions
Download Patch File Download Diff File Expand all files Collapse all files

105
contrib/postgres_fdw/sql/postgres_fdw.sql
View File

@ -604,28 +604,32 @@ INSERT INTO ft2 (c1,c2,c3) SELECT c1+1000,c2+100, c3 || c3 FROM ft2 LIMIT 20;
INSERT INTO ft2 (c1,c2,c3)
VALUES (1101,201,'aaa'), (1102,202,'bbb'), (1103,203,'ccc') RETURNING *;
INSERT INTO ft2 (c1,c2,c3) VALUES (1104,204,'ddd'), (1105,205,'eee');
EXPLAIN (verbose, costs off)
UPDATE ft2 SET c2 = c2 + 300, c3 = c3 || '_update3' WHERE c1 % 10 = 3; -- can be pushed down
UPDATE ft2 SET c2 = c2 + 300, c3 = c3 || '_update3' WHERE c1 % 10 = 3;
EXPLAIN (verbose, costs off)
UPDATE ft2 SET c2 = c2 + 400, c3 = c3 || '_update7' WHERE c1 % 10 = 7 RETURNING *; -- can be pushed down
UPDATE ft2 SET c2 = c2 + 400, c3 = c3 || '_update7' WHERE c1 % 10 = 7 RETURNING *;
EXPLAIN (verbose, costs off)
UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9;
FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9; -- can't be pushed down
UPDATE ft2 SET c2 = ft2.c2 + 500, c3 = ft2.c3 || '_update9', c7 = DEFAULT
FROM ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 9;
EXPLAIN (verbose, costs off)
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4; -- can be pushed down
DELETE FROM ft2 WHERE c1 % 10 = 5 RETURNING c1, c4;
EXPLAIN (verbose, costs off)
DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2;
DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2; -- can't be pushed down
DELETE FROM ft2 USING ft1 WHERE ft1.c1 = ft2.c2 AND ft1.c1 % 10 = 2;
SELECT c1,c2,c3,c4 FROM ft2 ORDER BY c1;
EXPLAIN (verbose, costs off)
INSERT INTO ft2 (c1,c2,c3) VALUES (9999,999,'foo') RETURNING tableoid::regclass;
INSERT INTO ft2 (c1,c2,c3) VALUES (9999,999,'foo') RETURNING tableoid::regclass;
EXPLAIN (verbose, costs off)
UPDATE ft2 SET c3 = 'bar' WHERE c1 = 9999 RETURNING tableoid::regclass;
UPDATE ft2 SET c3 = 'bar' WHERE c1 = 9999 RETURNING tableoid::regclass; -- can be pushed down
UPDATE ft2 SET c3 = 'bar' WHERE c1 = 9999 RETURNING tableoid::regclass;
EXPLAIN (verbose, costs off)
DELETE FROM ft2 WHERE c1 = 9999 RETURNING tableoid::regclass;
DELETE FROM ft2 WHERE c1 = 9999 RETURNING tableoid::regclass; -- can be pushed down
DELETE FROM ft2 WHERE c1 = 9999 RETURNING tableoid::regclass;
-- Test that trigger on remote table works as expected
@ -954,6 +958,90 @@ UPDATE rem1 SET f2 = 'testo';
-- Test returning a system attribute
INSERT INTO rem1(f2) VALUES ('test') RETURNING ctid;
-- cleanup
DROP TRIGGER trig_row_before ON rem1;
DROP TRIGGER trig_row_after ON rem1;
DROP TRIGGER trig_local_before ON loc1;
-- Test direct foreign table modification functionality
-- Test with statement-level triggers
CREATE TRIGGER trig_stmt_before
BEFORE DELETE OR INSERT OR UPDATE ON rem1
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_stmt_before ON rem1;
CREATE TRIGGER trig_stmt_after
AFTER DELETE OR INSERT OR UPDATE ON rem1
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_stmt_after ON rem1;
-- Test with row-level ON INSERT triggers
CREATE TRIGGER trig_row_before_insert
BEFORE INSERT ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_row_before_insert ON rem1;
CREATE TRIGGER trig_row_after_insert
AFTER INSERT ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_row_after_insert ON rem1;
-- Test with row-level ON UPDATE triggers
CREATE TRIGGER trig_row_before_update
BEFORE UPDATE ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can't be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_row_before_update ON rem1;
CREATE TRIGGER trig_row_after_update
AFTER UPDATE ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can't be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can be pushed down
DROP TRIGGER trig_row_after_update ON rem1;
-- Test with row-level ON DELETE triggers
CREATE TRIGGER trig_row_before_delete
BEFORE DELETE ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can't be pushed down
DROP TRIGGER trig_row_before_delete ON rem1;
CREATE TRIGGER trig_row_after_delete
AFTER DELETE ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can be pushed down
EXPLAIN (verbose, costs off)
DELETE FROM rem1; -- can't be pushed down
DROP TRIGGER trig_row_after_delete ON rem1;
-- ===================================================================
-- test inheritance features
-- ===================================================================
@ -1085,6 +1173,13 @@ fetch from c;
update bar set f2 = null where current of c;
rollback;
explain (verbose, costs off)
delete from foo where f1 < 5 returning *;
delete from foo where f1 < 5 returning *;
explain (verbose, costs off)
update bar set f2 = f2 + 100 returning *;
update bar set f2 = f2 + 100 returning *;
drop table foo cascade;
drop table bar cascade;
drop table loct1;