diff options
Diffstat (limited to 'contrib/postgres_fdw')
| -rw-r--r-- | contrib/postgres_fdw/expected/postgres_fdw.out | 85 | ||||
| -rw-r--r-- | contrib/postgres_fdw/sql/postgres_fdw.sql | 30 |
2 files changed, 115 insertions, 0 deletions
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out index a335e56a9df..583cce738aa 100644 --- a/contrib/postgres_fdw/expected/postgres_fdw.out +++ b/contrib/postgres_fdw/expected/postgres_fdw.out @@ -2589,6 +2589,91 @@ select c2, count(*) from "S 1"."T 1" where c2 < 500 group by 1 order by 1; (13 rows) -- =================================================================== +-- test check constraints +-- =================================================================== +-- Consistent check constraints provide consistent results +ALTER FOREIGN TABLE ft1 ADD CONSTRAINT ft1_c2positive CHECK (c2 >= 0); +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 < 0; + QUERY PLAN +------------------------------------------------------------------- + Aggregate + Output: count(*) + -> Foreign Scan on public.ft1 + Remote SQL: SELECT NULL FROM "S 1"."T 1" WHERE ((c2 < 0)) +(4 rows) + +SELECT count(*) FROM ft1 WHERE c2 < 0; + count +------- + 0 +(1 row) + +SET constraint_exclusion = 'on'; +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 < 0; + QUERY PLAN +-------------------------------- + Aggregate + Output: count(*) + -> Result + One-Time Filter: false +(4 rows) + +SELECT count(*) FROM ft1 WHERE c2 < 0; + count +------- + 0 +(1 row) + +RESET constraint_exclusion; +-- check constraint is enforced on the remote side, not locally +INSERT INTO ft1(c1, c2) VALUES(1111, -2); -- c2positive +ERROR: new row for relation "T 1" violates check constraint "c2positive" +DETAIL: Failing row contains (1111, -2, null, null, null, null, ft1 , null). +CONTEXT: Remote SQL command: INSERT INTO "S 1"."T 1"("C 1", c2, c3, c4, c5, c6, c7, c8) VALUES ($1, $2, $3, $4, $5, $6, $7, $8) +UPDATE ft1 SET c2 = -c2 WHERE c1 = 1; -- c2positive +ERROR: new row for relation "T 1" violates check constraint "c2positive" +DETAIL: Failing row contains (1, -1, 00001_trig_update, 1970-01-02 08:00:00+00, 1970-01-02 00:00:00, 1, 1 , foo). +CONTEXT: Remote SQL command: UPDATE "S 1"."T 1" SET c2 = $2 WHERE ctid = $1 +ALTER FOREIGN TABLE ft1 DROP CONSTRAINT ft1_c2positive; +-- But inconsistent check constraints provide inconsistent results +ALTER FOREIGN TABLE ft1 ADD CONSTRAINT ft1_c2negative CHECK (c2 < 0); +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 >= 0; + QUERY PLAN +-------------------------------------------------------------------- + Aggregate + Output: count(*) + -> Foreign Scan on public.ft1 + Remote SQL: SELECT NULL FROM "S 1"."T 1" WHERE ((c2 >= 0)) +(4 rows) + +SELECT count(*) FROM ft1 WHERE c2 >= 0; + count +------- + 821 +(1 row) + +SET constraint_exclusion = 'on'; +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 >= 0; + QUERY PLAN +-------------------------------- + Aggregate + Output: count(*) + -> Result + One-Time Filter: false +(4 rows) + +SELECT count(*) FROM ft1 WHERE c2 >= 0; + count +------- + 0 +(1 row) + +RESET constraint_exclusion; +-- local check constraint is not actually enforced +INSERT INTO ft1(c1, c2) VALUES(1111, 2); +UPDATE ft1 SET c2 = c2 + 1 WHERE c1 = 1; +ALTER FOREIGN TABLE ft1 DROP CONSTRAINT ft1_c2negative; +-- =================================================================== -- test serial columns (ie, sequence-based defaults) -- =================================================================== create table loc1 (f1 serial, f2 text); diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql index fcfb10d29ea..83e8fa7b045 100644 --- a/contrib/postgres_fdw/sql/postgres_fdw.sql +++ b/contrib/postgres_fdw/sql/postgres_fdw.sql @@ -406,6 +406,36 @@ select c2, count(*) from ft2 where c2 < 500 group by 1 order by 1; select c2, count(*) from "S 1"."T 1" where c2 < 500 group by 1 order by 1; -- =================================================================== +-- test check constraints +-- =================================================================== + +-- Consistent check constraints provide consistent results +ALTER FOREIGN TABLE ft1 ADD CONSTRAINT ft1_c2positive CHECK (c2 >= 0); +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 < 0; +SELECT count(*) FROM ft1 WHERE c2 < 0; +SET constraint_exclusion = 'on'; +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 < 0; +SELECT count(*) FROM ft1 WHERE c2 < 0; +RESET constraint_exclusion; +-- check constraint is enforced on the remote side, not locally +INSERT INTO ft1(c1, c2) VALUES(1111, -2); -- c2positive +UPDATE ft1 SET c2 = -c2 WHERE c1 = 1; -- c2positive +ALTER FOREIGN TABLE ft1 DROP CONSTRAINT ft1_c2positive; + +-- But inconsistent check constraints provide inconsistent results +ALTER FOREIGN TABLE ft1 ADD CONSTRAINT ft1_c2negative CHECK (c2 < 0); +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 >= 0; +SELECT count(*) FROM ft1 WHERE c2 >= 0; +SET constraint_exclusion = 'on'; +EXPLAIN (VERBOSE, COSTS false) SELECT count(*) FROM ft1 WHERE c2 >= 0; +SELECT count(*) FROM ft1 WHERE c2 >= 0; +RESET constraint_exclusion; +-- local check constraint is not actually enforced +INSERT INTO ft1(c1, c2) VALUES(1111, 2); +UPDATE ft1 SET c2 = c2 + 1 WHERE c1 = 1; +ALTER FOREIGN TABLE ft1 DROP CONSTRAINT ft1_c2negative; + +-- =================================================================== -- test serial columns (ie, sequence-based defaults) -- =================================================================== create table loc1 (f1 serial, f2 text); |