705 lines
35 KiB
Plaintext
705 lines
35 KiB
Plaintext
-- ===================================================================
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-- create FDW objects
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-- ===================================================================
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CREATE EXTENSION postgres_fdw;
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CREATE SERVER testserver1 FOREIGN DATA WRAPPER postgres_fdw;
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CREATE SERVER loopback FOREIGN DATA WRAPPER postgres_fdw
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OPTIONS (dbname 'contrib_regression');
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CREATE USER MAPPING FOR public SERVER testserver1
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OPTIONS (user 'value', password 'value');
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CREATE USER MAPPING FOR CURRENT_USER SERVER loopback;
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-- ===================================================================
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-- create objects used through FDW loopback server
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-- ===================================================================
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CREATE TYPE user_enum AS ENUM ('foo', 'bar', 'buz');
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CREATE SCHEMA "S 1";
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CREATE TABLE "S 1"."T 1" (
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"C 1" int NOT NULL,
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c2 int NOT NULL,
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c3 text,
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c4 timestamptz,
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c5 timestamp,
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c6 varchar(10),
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c7 char(10),
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c8 user_enum,
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CONSTRAINT t1_pkey PRIMARY KEY ("C 1")
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);
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CREATE TABLE "S 1"."T 2" (
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c1 int NOT NULL,
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c2 text,
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CONSTRAINT t2_pkey PRIMARY KEY (c1)
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);
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INSERT INTO "S 1"."T 1"
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SELECT id,
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id % 10,
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to_char(id, 'FM00000'),
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'1970-01-01'::timestamptz + ((id % 100) || ' days')::interval,
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'1970-01-01'::timestamp + ((id % 100) || ' days')::interval,
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id % 10,
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id % 10,
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'foo'::user_enum
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FROM generate_series(1, 1000) id;
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INSERT INTO "S 1"."T 2"
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SELECT id,
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'AAA' || to_char(id, 'FM000')
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FROM generate_series(1, 100) id;
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ANALYZE "S 1"."T 1";
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ANALYZE "S 1"."T 2";
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-- ===================================================================
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-- create foreign tables
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-- ===================================================================
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CREATE FOREIGN TABLE ft1 (
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c0 int,
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c1 int NOT NULL,
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c2 int NOT NULL,
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c3 text,
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c4 timestamptz,
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c5 timestamp,
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c6 varchar(10),
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c7 char(10),
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c8 user_enum
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) SERVER loopback;
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ALTER FOREIGN TABLE ft1 DROP COLUMN c0;
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CREATE FOREIGN TABLE ft2 (
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c0 int,
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c1 int NOT NULL,
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c2 int NOT NULL,
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c3 text,
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c4 timestamptz,
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c5 timestamp,
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c6 varchar(10),
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c7 char(10),
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c8 user_enum
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) SERVER loopback;
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ALTER FOREIGN TABLE ft2 DROP COLUMN c0;
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-- ===================================================================
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-- tests for validator
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-- ===================================================================
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-- requiressl, krbsrvname and gsslib are omitted because they depend on
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-- configure options
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ALTER SERVER testserver1 OPTIONS (
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use_remote_explain 'false',
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fdw_startup_cost '123.456',
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fdw_tuple_cost '0.123',
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service 'value',
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connect_timeout 'value',
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dbname 'value',
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host 'value',
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hostaddr 'value',
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port 'value',
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--client_encoding 'value',
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application_name 'value',
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--fallback_application_name 'value',
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keepalives 'value',
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keepalives_idle 'value',
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keepalives_interval 'value',
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-- requiressl 'value',
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sslcompression 'value',
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sslmode 'value',
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sslcert 'value',
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sslkey 'value',
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sslrootcert 'value',
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sslcrl 'value'
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--requirepeer 'value',
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-- krbsrvname 'value',
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-- gsslib 'value',
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--replication 'value'
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);
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ALTER USER MAPPING FOR public SERVER testserver1
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OPTIONS (DROP user, DROP password);
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ALTER FOREIGN TABLE ft1 OPTIONS (schema_name 'S 1', table_name 'T 1');
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ALTER FOREIGN TABLE ft2 OPTIONS (schema_name 'S 1', table_name 'T 1');
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ALTER FOREIGN TABLE ft1 ALTER COLUMN c1 OPTIONS (column_name 'C 1');
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ALTER FOREIGN TABLE ft2 ALTER COLUMN c1 OPTIONS (column_name 'C 1');
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\det+
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List of foreign tables
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Schema | Table | Server | FDW Options | Description
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--------+-------+----------+---------------------------------------+-------------
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public | ft1 | loopback | (schema_name 'S 1', table_name 'T 1') |
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public | ft2 | loopback | (schema_name 'S 1', table_name 'T 1') |
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(2 rows)
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-- Now we should be able to run ANALYZE.
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-- To exercise multiple code paths, we use local stats on ft1
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-- and remote_explain mode on ft2.
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ANALYZE ft1;
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ALTER FOREIGN TABLE ft2 OPTIONS (use_remote_explain 'true');
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-- ===================================================================
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-- simple queries
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-- ===================================================================
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-- single table, with/without alias
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EXPLAIN (COSTS false) SELECT * FROM ft1 ORDER BY c3, c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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---------------------------------
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Limit
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-> Sort
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Sort Key: c3, c1
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-> Foreign Scan on ft1
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(4 rows)
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SELECT * FROM ft1 ORDER BY c3, c1 OFFSET 100 LIMIT 10;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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-----+----+-------+------------------------------+--------------------------+----+------------+-----
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101 | 1 | 00101 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
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102 | 2 | 00102 | Sat Jan 03 00:00:00 1970 PST | Sat Jan 03 00:00:00 1970 | 2 | 2 | foo
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103 | 3 | 00103 | Sun Jan 04 00:00:00 1970 PST | Sun Jan 04 00:00:00 1970 | 3 | 3 | foo
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104 | 4 | 00104 | Mon Jan 05 00:00:00 1970 PST | Mon Jan 05 00:00:00 1970 | 4 | 4 | foo
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105 | 5 | 00105 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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106 | 6 | 00106 | Wed Jan 07 00:00:00 1970 PST | Wed Jan 07 00:00:00 1970 | 6 | 6 | foo
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107 | 7 | 00107 | Thu Jan 08 00:00:00 1970 PST | Thu Jan 08 00:00:00 1970 | 7 | 7 | foo
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108 | 8 | 00108 | Fri Jan 09 00:00:00 1970 PST | Fri Jan 09 00:00:00 1970 | 8 | 8 | foo
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109 | 9 | 00109 | Sat Jan 10 00:00:00 1970 PST | Sat Jan 10 00:00:00 1970 | 9 | 9 | foo
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110 | 0 | 00110 | Sun Jan 11 00:00:00 1970 PST | Sun Jan 11 00:00:00 1970 | 0 | 0 | foo
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(10 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 ORDER BY t1.c3, t1.c1 OFFSET 100 LIMIT 10;
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QUERY PLAN
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-------------------------------------------------------------------------------------
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Limit
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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-> Sort
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Sort Key: t1.c3, t1.c1
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-> Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1"
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(8 rows)
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SELECT * FROM ft1 t1 ORDER BY t1.c3, t1.c1 OFFSET 100 LIMIT 10;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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-----+----+-------+------------------------------+--------------------------+----+------------+-----
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101 | 1 | 00101 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
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102 | 2 | 00102 | Sat Jan 03 00:00:00 1970 PST | Sat Jan 03 00:00:00 1970 | 2 | 2 | foo
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103 | 3 | 00103 | Sun Jan 04 00:00:00 1970 PST | Sun Jan 04 00:00:00 1970 | 3 | 3 | foo
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104 | 4 | 00104 | Mon Jan 05 00:00:00 1970 PST | Mon Jan 05 00:00:00 1970 | 4 | 4 | foo
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105 | 5 | 00105 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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106 | 6 | 00106 | Wed Jan 07 00:00:00 1970 PST | Wed Jan 07 00:00:00 1970 | 6 | 6 | foo
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107 | 7 | 00107 | Thu Jan 08 00:00:00 1970 PST | Thu Jan 08 00:00:00 1970 | 7 | 7 | foo
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108 | 8 | 00108 | Fri Jan 09 00:00:00 1970 PST | Fri Jan 09 00:00:00 1970 | 8 | 8 | foo
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109 | 9 | 00109 | Sat Jan 10 00:00:00 1970 PST | Sat Jan 10 00:00:00 1970 | 9 | 9 | foo
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110 | 0 | 00110 | Sun Jan 11 00:00:00 1970 PST | Sun Jan 11 00:00:00 1970 | 0 | 0 | foo
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(10 rows)
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-- empty result
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SELECT * FROM ft1 WHERE false;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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----+----+----+----+----+----+----+----
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(0 rows)
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-- with WHERE clause
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = 101 AND t1.c6 = '1' AND t1.c7 >= '1';
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE ((c7 OPERATOR(pg_catalog.>=) '1'::bpchar)) AND (("C 1" OPERATOR(pg_catalog.=) 101)) AND ((c6::text OPERATOR(pg_catalog.=) '1'::text))
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(3 rows)
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SELECT * FROM ft1 t1 WHERE t1.c1 = 101 AND t1.c6 = '1' AND t1.c7 >= '1';
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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-----+----+-------+------------------------------+--------------------------+----+------------+-----
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101 | 1 | 00101 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
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(1 row)
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-- aggregate
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SELECT COUNT(*) FROM ft1 t1;
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count
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-------
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1000
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(1 row)
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-- join two tables
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SELECT t1.c1 FROM ft1 t1 JOIN ft2 t2 ON (t1.c1 = t2.c1) ORDER BY t1.c3, t1.c1 OFFSET 100 LIMIT 10;
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c1
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-----
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101
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102
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103
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104
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105
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106
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107
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108
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109
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110
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(10 rows)
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-- subquery
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SELECT * FROM ft1 t1 WHERE t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 <= 10) ORDER BY c1;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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----+----+-------+------------------------------+--------------------------+----+------------+-----
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1 | 1 | 00001 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
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2 | 2 | 00002 | Sat Jan 03 00:00:00 1970 PST | Sat Jan 03 00:00:00 1970 | 2 | 2 | foo
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3 | 3 | 00003 | Sun Jan 04 00:00:00 1970 PST | Sun Jan 04 00:00:00 1970 | 3 | 3 | foo
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4 | 4 | 00004 | Mon Jan 05 00:00:00 1970 PST | Mon Jan 05 00:00:00 1970 | 4 | 4 | foo
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5 | 5 | 00005 | Tue Jan 06 00:00:00 1970 PST | Tue Jan 06 00:00:00 1970 | 5 | 5 | foo
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6 | 6 | 00006 | Wed Jan 07 00:00:00 1970 PST | Wed Jan 07 00:00:00 1970 | 6 | 6 | foo
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7 | 7 | 00007 | Thu Jan 08 00:00:00 1970 PST | Thu Jan 08 00:00:00 1970 | 7 | 7 | foo
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8 | 8 | 00008 | Fri Jan 09 00:00:00 1970 PST | Fri Jan 09 00:00:00 1970 | 8 | 8 | foo
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9 | 9 | 00009 | Sat Jan 10 00:00:00 1970 PST | Sat Jan 10 00:00:00 1970 | 9 | 9 | foo
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10 | 0 | 00010 | Sun Jan 11 00:00:00 1970 PST | Sun Jan 11 00:00:00 1970 | 0 | 0 | foo
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(10 rows)
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-- subquery+MAX
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SELECT * FROM ft1 t1 WHERE t1.c3 = (SELECT MAX(c3) FROM ft2 t2) ORDER BY c1;
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c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
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------+----+-------+------------------------------+--------------------------+----+------------+-----
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1000 | 0 | 01000 | Thu Jan 01 00:00:00 1970 PST | Thu Jan 01 00:00:00 1970 | 0 | 0 | foo
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(1 row)
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-- used in CTE
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WITH t1 AS (SELECT * FROM ft1 WHERE c1 <= 10) SELECT t2.c1, t2.c2, t2.c3, t2.c4 FROM t1, ft2 t2 WHERE t1.c1 = t2.c1 ORDER BY t1.c1;
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c1 | c2 | c3 | c4
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----+----+-------+------------------------------
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1 | 1 | 00001 | Fri Jan 02 00:00:00 1970 PST
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2 | 2 | 00002 | Sat Jan 03 00:00:00 1970 PST
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3 | 3 | 00003 | Sun Jan 04 00:00:00 1970 PST
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4 | 4 | 00004 | Mon Jan 05 00:00:00 1970 PST
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5 | 5 | 00005 | Tue Jan 06 00:00:00 1970 PST
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6 | 6 | 00006 | Wed Jan 07 00:00:00 1970 PST
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7 | 7 | 00007 | Thu Jan 08 00:00:00 1970 PST
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8 | 8 | 00008 | Fri Jan 09 00:00:00 1970 PST
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9 | 9 | 00009 | Sat Jan 10 00:00:00 1970 PST
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10 | 0 | 00010 | Sun Jan 11 00:00:00 1970 PST
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(10 rows)
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-- fixed values
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SELECT 'fixed', NULL FROM ft1 t1 WHERE c1 = 1;
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?column? | ?column?
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----------+----------
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fixed |
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(1 row)
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-- user-defined operator/function
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CREATE FUNCTION postgres_fdw_abs(int) RETURNS int AS $$
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BEGIN
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RETURN abs($1);
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END
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$$ LANGUAGE plpgsql IMMUTABLE;
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CREATE OPERATOR === (
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LEFTARG = int,
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RIGHTARG = int,
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PROCEDURE = int4eq,
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COMMUTATOR = ===,
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NEGATOR = !==
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);
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = postgres_fdw_abs(t1.c2);
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QUERY PLAN
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-------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Filter: (t1.c1 = postgres_fdw_abs(t1.c2))
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1"
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(4 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 === t1.c2;
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QUERY PLAN
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-------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Filter: (t1.c1 === t1.c2)
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1"
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(4 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = abs(t1.c2);
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QUERY PLAN
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-----------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) pg_catalog.abs(c2)))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = t1.c2;
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QUERY PLAN
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-------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) c2))
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(3 rows)
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-- ===================================================================
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-- WHERE with remotely-executable conditions
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-- ===================================================================
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = 1; -- Var, OpExpr(b), Const
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QUERY PLAN
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------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE t1.c1 = 100 AND t1.c2 = 0; -- BoolExpr
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 100)) AND ((c2 OPERATOR(pg_catalog.=) 0))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c1 IS NULL; -- NullTest
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QUERY PLAN
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-------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" IS NULL))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c1 IS NOT NULL; -- NullTest
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QUERY PLAN
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-----------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" IS NOT NULL))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE round(abs(c1), 0) = 1; -- FuncExpr
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE ((pg_catalog.round(pg_catalog."numeric"(pg_catalog.abs("C 1")), 0) OPERATOR(pg_catalog.=) 1::numeric))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c1 = -c1; -- OpExpr(l)
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QUERY PLAN
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-----------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) (OPERATOR(pg_catalog.-) "C 1")))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE 1 = c1!; -- OpExpr(r)
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE ((1::numeric OPERATOR(pg_catalog.=) (pg_catalog.int8("C 1") OPERATOR(pg_catalog.!))))
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(3 rows)
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EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE (c1 IS NOT NULL) IS DISTINCT FROM (c1 IS NOT NULL); -- DistinctExpr
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------------------
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Foreign Scan on public.ft1 t1
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Output: c1, c2, c3, c4, c5, c6, c7, c8
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Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE ((("C 1" IS NOT NULL) IS DISTINCT FROM ("C 1" IS NOT NULL)))
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(3 rows)
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|
|
|
EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c1 = ANY(ARRAY[c2, 1, c1 + 0]); -- ScalarArrayOpExpr
|
|
QUERY PLAN
|
|
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) ANY (ARRAY[c2, 1, ("C 1" OPERATOR(pg_catalog.+) 0)])))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c1 = (ARRAY[c1,c2,3])[1]; -- ArrayRef
|
|
QUERY PLAN
|
|
-------------------------------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) ((ARRAY["C 1", c2, 3])[1])))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c6 = E'foo''s\\bar'; -- check special chars
|
|
QUERY PLAN
|
|
----------------------------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE ((c6::text OPERATOR(pg_catalog.=) E'foo''s\\bar'::text))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) SELECT * FROM ft1 t1 WHERE c8 = 'foo'; -- can't be sent to remote
|
|
QUERY PLAN
|
|
-------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1"
|
|
(4 rows)
|
|
|
|
-- ===================================================================
|
|
-- parameterized queries
|
|
-- ===================================================================
|
|
-- simple join
|
|
PREPARE st1(int, int) AS SELECT t1.c3, t2.c3 FROM ft1 t1, ft2 t2 WHERE t1.c1 = $1 AND t2.c1 = $2;
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st1(1, 2);
|
|
QUERY PLAN
|
|
-----------------------------------------------------------------------------------------------------------------------------------
|
|
Nested Loop
|
|
Output: t1.c3, t2.c3
|
|
-> Foreign Scan on public.ft1 t1
|
|
Output: t1.c3
|
|
Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
-> Foreign Scan on public.ft2 t2
|
|
Output: t2.c3
|
|
Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 2))
|
|
(8 rows)
|
|
|
|
EXECUTE st1(1, 1);
|
|
c3 | c3
|
|
-------+-------
|
|
00001 | 00001
|
|
(1 row)
|
|
|
|
EXECUTE st1(101, 101);
|
|
c3 | c3
|
|
-------+-------
|
|
00101 | 00101
|
|
(1 row)
|
|
|
|
-- subquery using stable function (can't be sent to remote)
|
|
PREPARE st2(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 < $2 AND t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 > $1 AND EXTRACT(dow FROM c4) = 6) ORDER BY c1;
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st2(10, 20);
|
|
QUERY PLAN
|
|
----------------------------------------------------------------------------------------------------------------------------------------------
|
|
Sort
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Sort Key: t1.c1
|
|
-> Nested Loop Semi Join
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Join Filter: (t1.c3 = t2.c3)
|
|
-> Foreign Scan on public.ft1 t1
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.<) 20))
|
|
-> Materialize
|
|
Output: t2.c3
|
|
-> Foreign Scan on public.ft2 t2
|
|
Output: t2.c3
|
|
Filter: (date_part('dow'::text, t2.c4) = 6::double precision)
|
|
Remote SQL: SELECT NULL, NULL, c3, c4, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.>) 10))
|
|
(15 rows)
|
|
|
|
EXECUTE st2(10, 20);
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
16 | 6 | 00016 | Sat Jan 17 00:00:00 1970 PST | Sat Jan 17 00:00:00 1970 | 6 | 6 | foo
|
|
(1 row)
|
|
|
|
EXECUTE st1(101, 101);
|
|
c3 | c3
|
|
-------+-------
|
|
00101 | 00101
|
|
(1 row)
|
|
|
|
-- subquery using immutable function (can be sent to remote)
|
|
PREPARE st3(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 < $2 AND t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 > $1 AND EXTRACT(dow FROM c5) = 6) ORDER BY c1;
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st3(10, 20);
|
|
QUERY PLAN
|
|
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|
Sort
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Sort Key: t1.c1
|
|
-> Nested Loop Semi Join
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Join Filter: (t1.c3 = t2.c3)
|
|
-> Foreign Scan on public.ft1 t1
|
|
Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.<) 20))
|
|
-> Materialize
|
|
Output: t2.c3
|
|
-> Foreign Scan on public.ft2 t2
|
|
Output: t2.c3
|
|
Remote SQL: SELECT NULL, NULL, c3, NULL, NULL, NULL, NULL, NULL FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.>) 10)) AND ((pg_catalog.date_part('dow'::text, c5) OPERATOR(pg_catalog.=) 6::double precision))
|
|
(14 rows)
|
|
|
|
EXECUTE st3(10, 20);
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
16 | 6 | 00016 | Sat Jan 17 00:00:00 1970 PST | Sat Jan 17 00:00:00 1970 | 6 | 6 | foo
|
|
(1 row)
|
|
|
|
EXECUTE st3(20, 30);
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
23 | 3 | 00023 | Sat Jan 24 00:00:00 1970 PST | Sat Jan 24 00:00:00 1970 | 3 | 3 | foo
|
|
(1 row)
|
|
|
|
-- custom plan should be chosen initially
|
|
PREPARE st4(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 = $1;
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(3 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(3 rows)
|
|
|
|
-- once we try it enough times, should switch to generic plan
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st4(1);
|
|
QUERY PLAN
|
|
-------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) $1))
|
|
(3 rows)
|
|
|
|
-- value of $1 should not be sent to remote
|
|
PREPARE st5(user_enum,int) AS SELECT * FROM ft1 t1 WHERE c8 = $1 and c1 = $2;
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(4 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(4 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(4 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(4 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = 'foo'::user_enum)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) 1))
|
|
(4 rows)
|
|
|
|
EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1);
|
|
QUERY PLAN
|
|
-------------------------------------------------------------------------------------------------------------------
|
|
Foreign Scan on public.ft1 t1
|
|
Output: c1, c2, c3, c4, c5, c6, c7, c8
|
|
Filter: (t1.c8 = $1)
|
|
Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" OPERATOR(pg_catalog.=) $2))
|
|
(4 rows)
|
|
|
|
EXECUTE st5('foo', 1);
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
1 | 1 | 00001 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
|
|
(1 row)
|
|
|
|
-- cleanup
|
|
DEALLOCATE st1;
|
|
DEALLOCATE st2;
|
|
DEALLOCATE st3;
|
|
DEALLOCATE st4;
|
|
DEALLOCATE st5;
|
|
-- ===================================================================
|
|
-- used in pl/pgsql function
|
|
-- ===================================================================
|
|
CREATE OR REPLACE FUNCTION f_test(p_c1 int) RETURNS int AS $$
|
|
DECLARE
|
|
v_c1 int;
|
|
BEGIN
|
|
SELECT c1 INTO v_c1 FROM ft1 WHERE c1 = p_c1 LIMIT 1;
|
|
PERFORM c1 FROM ft1 WHERE c1 = p_c1 AND p_c1 = v_c1 LIMIT 1;
|
|
RETURN v_c1;
|
|
END;
|
|
$$ LANGUAGE plpgsql;
|
|
SELECT f_test(100);
|
|
f_test
|
|
--------
|
|
100
|
|
(1 row)
|
|
|
|
DROP FUNCTION f_test(int);
|
|
-- ===================================================================
|
|
-- conversion error
|
|
-- ===================================================================
|
|
ALTER FOREIGN TABLE ft1 ALTER COLUMN c8 TYPE int;
|
|
SELECT * FROM ft1 WHERE c1 = 1; -- ERROR
|
|
ERROR: invalid input syntax for integer: "foo"
|
|
CONTEXT: column "c8" of foreign table "ft1"
|
|
ALTER FOREIGN TABLE ft1 ALTER COLUMN c8 TYPE user_enum;
|
|
-- ===================================================================
|
|
-- subtransaction
|
|
-- + local/remote error doesn't break cursor
|
|
-- ===================================================================
|
|
BEGIN;
|
|
DECLARE c CURSOR FOR SELECT * FROM ft1 ORDER BY c1;
|
|
FETCH c;
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
1 | 1 | 00001 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
|
|
(1 row)
|
|
|
|
SAVEPOINT s;
|
|
ERROR OUT; -- ERROR
|
|
ERROR: syntax error at or near "ERROR"
|
|
LINE 1: ERROR OUT;
|
|
^
|
|
ROLLBACK TO s;
|
|
FETCH c;
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
2 | 2 | 00002 | Sat Jan 03 00:00:00 1970 PST | Sat Jan 03 00:00:00 1970 | 2 | 2 | foo
|
|
(1 row)
|
|
|
|
SAVEPOINT s;
|
|
SELECT * FROM ft1 WHERE 1 / (c1 - 1) > 0; -- ERROR
|
|
ERROR: division by zero
|
|
CONTEXT: Remote SQL command: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (((1 OPERATOR(pg_catalog./) ("C 1" OPERATOR(pg_catalog.-) 1)) OPERATOR(pg_catalog.>) 0))
|
|
ROLLBACK TO s;
|
|
FETCH c;
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
3 | 3 | 00003 | Sun Jan 04 00:00:00 1970 PST | Sun Jan 04 00:00:00 1970 | 3 | 3 | foo
|
|
(1 row)
|
|
|
|
SELECT * FROM ft1 ORDER BY c1 LIMIT 1;
|
|
c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8
|
|
----+----+-------+------------------------------+--------------------------+----+------------+-----
|
|
1 | 1 | 00001 | Fri Jan 02 00:00:00 1970 PST | Fri Jan 02 00:00:00 1970 | 1 | 1 | foo
|
|
(1 row)
|
|
|
|
COMMIT;
|