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Implement IMPORT FOREIGN SCHEMA.
This command provides an automated way to create foreign table definitions that match remote tables, thereby reducing tedium and chances for error. In this patch, we provide the necessary core-server infrastructure and implement the feature fully in the postgres_fdw foreign-data wrapper. Other wrappers will throw a "feature not supported" error until/unless they are updated. Ronan Dunklau and Michael Paquier, additional work by me
1 parent 6a605cd commit 59efda3

29 files changed

+1239
-15
lines changed

‎contrib/postgres_fdw/deparse.c

+1-2
Original file line numberDiff line numberDiff line change
@@ -116,7 +116,6 @@ static void deparseReturningList(StringInfo buf, PlannerInfo *root,
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static void deparseColumnRef(StringInfo buf, int varno, int varattno,
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PlannerInfo *root);
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static void deparseRelation(StringInfo buf, Relation rel);
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static void deparseStringLiteral(StringInfo buf, const char *val);
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static void deparseExpr(Expr *expr, deparse_expr_cxt *context);
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static void deparseVar(Var *node, deparse_expr_cxt *context);
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static void deparseConst(Const *node, deparse_expr_cxt *context);
@@ -1160,7 +1159,7 @@ deparseRelation(StringInfo buf, Relation rel)
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/*
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* Append a SQL string literal representing "val" to buf.
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*/
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static void
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void
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deparseStringLiteral(StringInfo buf, const char *val)
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{
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const char *valptr;

‎contrib/postgres_fdw/expected/postgres_fdw.out

+230
Original file line numberDiff line numberDiff line change
@@ -2834,3 +2834,233 @@ NOTICE: NEW: (13,"test triggered !")
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(0,27)
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(1 row)
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-- ===================================================================
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-- test IMPORT FOREIGN SCHEMA
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-- ===================================================================
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CREATE SCHEMA import_source;
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CREATE TABLE import_source.t1 (c1 int, c2 varchar NOT NULL);
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CREATE TABLE import_source.t2 (c1 int default 42, c2 varchar NULL, c3 text collate "POSIX");
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CREATE TYPE typ1 AS (m1 int, m2 varchar);
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CREATE TABLE import_source.t3 (c1 timestamptz default now(), c2 typ1);
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CREATE TABLE import_source."x 4" (c1 float8, "C 2" text, c3 varchar(42));
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CREATE TABLE import_source."x 5" (c1 float8);
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ALTER TABLE import_source."x 5" DROP COLUMN c1;
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CREATE SCHEMA import_dest1;
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IMPORT FOREIGN SCHEMA import_source FROM SERVER loopback INTO import_dest1;
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\det+ import_dest1
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List of foreign tables
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Schema | Table | Server | FDW Options | Description
2853+
--------------+-------+----------+-------------------------------------------------+-------------
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import_dest1 | t1 | loopback | (schema_name 'import_source', table_name 't1') |
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import_dest1 | t2 | loopback | (schema_name 'import_source', table_name 't2') |
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import_dest1 | t3 | loopback | (schema_name 'import_source', table_name 't3') |
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import_dest1 | x 4 | loopback | (schema_name 'import_source', table_name 'x 4') |
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import_dest1 | x 5 | loopback | (schema_name 'import_source', table_name 'x 5') |
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(5 rows)
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\d import_dest1.*
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Foreign table "import_dest1.t1"
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Column | Type | Modifiers | FDW Options
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--------+-------------------+-----------+--------------------
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c1 | integer | | (column_name 'c1')
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c2 | character varying | not null | (column_name 'c2')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't1')
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Foreign table "import_dest1.t2"
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Column | Type | Modifiers | FDW Options
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--------+-------------------+---------------+--------------------
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c1 | integer | | (column_name 'c1')
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c2 | character varying | | (column_name 'c2')
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c3 | text | collate POSIX | (column_name 'c3')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't2')
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Foreign table "import_dest1.t3"
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Column | Type | Modifiers | FDW Options
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--------+--------------------------+-----------+--------------------
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c1 | timestamp with time zone | | (column_name 'c1')
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c2 | typ1 | | (column_name 'c2')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't3')
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Foreign table "import_dest1.x 4"
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Column | Type | Modifiers | FDW Options
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--------+-----------------------+-----------+---------------------
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c1 | double precision | | (column_name 'c1')
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C 2 | text | | (column_name 'C 2')
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c3 | character varying(42) | | (column_name 'c3')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 'x 4')
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Foreign table "import_dest1.x 5"
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Column | Type | Modifiers | FDW Options
2898+
--------+------+-----------+-------------
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 'x 5')
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-- Options
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CREATE SCHEMA import_dest2;
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IMPORT FOREIGN SCHEMA import_source FROM SERVER loopback INTO import_dest2
2905+
OPTIONS (import_default 'true');
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\det+ import_dest2
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List of foreign tables
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Schema | Table | Server | FDW Options | Description
2909+
--------------+-------+----------+-------------------------------------------------+-------------
2910+
import_dest2 | t1 | loopback | (schema_name 'import_source', table_name 't1') |
2911+
import_dest2 | t2 | loopback | (schema_name 'import_source', table_name 't2') |
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import_dest2 | t3 | loopback | (schema_name 'import_source', table_name 't3') |
2913+
import_dest2 | x 4 | loopback | (schema_name 'import_source', table_name 'x 4') |
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import_dest2 | x 5 | loopback | (schema_name 'import_source', table_name 'x 5') |
2915+
(5 rows)
2916+
2917+
\d import_dest2.*
2918+
Foreign table "import_dest2.t1"
2919+
Column | Type | Modifiers | FDW Options
2920+
--------+-------------------+-----------+--------------------
2921+
c1 | integer | | (column_name 'c1')
2922+
c2 | character varying | not null | (column_name 'c2')
2923+
Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't1')
2925+
2926+
Foreign table "import_dest2.t2"
2927+
Column | Type | Modifiers | FDW Options
2928+
--------+-------------------+---------------+--------------------
2929+
c1 | integer | default 42 | (column_name 'c1')
2930+
c2 | character varying | | (column_name 'c2')
2931+
c3 | text | collate POSIX | (column_name 'c3')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't2')
2934+
2935+
Foreign table "import_dest2.t3"
2936+
Column | Type | Modifiers | FDW Options
2937+
--------+--------------------------+---------------+--------------------
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c1 | timestamp with time zone | default now() | (column_name 'c1')
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c2 | typ1 | | (column_name 'c2')
2940+
Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't3')
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2943+
Foreign table "import_dest2.x 4"
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Column | Type | Modifiers | FDW Options
2945+
--------+-----------------------+-----------+---------------------
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c1 | double precision | | (column_name 'c1')
2947+
C 2 | text | | (column_name 'C 2')
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c3 | character varying(42) | | (column_name 'c3')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 'x 4')
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Foreign table "import_dest2.x 5"
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Column | Type | Modifiers | FDW Options
2954+
--------+------+-----------+-------------
2955+
Server: loopback
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FDW Options: (schema_name 'import_source', table_name 'x 5')
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2958+
CREATE SCHEMA import_dest3;
2959+
IMPORT FOREIGN SCHEMA import_source FROM SERVER loopback INTO import_dest3
2960+
OPTIONS (import_collate 'false', import_not_null 'false');
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\det+ import_dest3
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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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import_dest3 | t1 | loopback | (schema_name 'import_source', table_name 't1') |
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import_dest3 | t2 | loopback | (schema_name 'import_source', table_name 't2') |
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import_dest3 | t3 | loopback | (schema_name 'import_source', table_name 't3') |
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import_dest3 | x 4 | loopback | (schema_name 'import_source', table_name 'x 4') |
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import_dest3 | x 5 | loopback | (schema_name 'import_source', table_name 'x 5') |
2970+
(5 rows)
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\d import_dest3.*
2973+
Foreign table "import_dest3.t1"
2974+
Column | Type | Modifiers | FDW Options
2975+
--------+-------------------+-----------+--------------------
2976+
c1 | integer | | (column_name 'c1')
2977+
c2 | character varying | | (column_name 'c2')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't1')
2980+
2981+
Foreign table "import_dest3.t2"
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Column | Type | Modifiers | FDW Options
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--------+-------------------+-----------+--------------------
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c1 | integer | | (column_name 'c1')
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c2 | character varying | | (column_name 'c2')
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c3 | text | | (column_name 'c3')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't2')
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Foreign table "import_dest3.t3"
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Column | Type | Modifiers | FDW Options
2992+
--------+--------------------------+-----------+--------------------
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c1 | timestamp with time zone | | (column_name 'c1')
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c2 | typ1 | | (column_name 'c2')
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Server: loopback
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FDW Options: (schema_name 'import_source', table_name 't3')
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2998+
Foreign table "import_dest3.x 4"
2999+
Column | Type | Modifiers | FDW Options
3000+
--------+-----------------------+-----------+---------------------
3001+
c1 | double precision | | (column_name 'c1')
3002+
C 2 | text | | (column_name 'C 2')
3003+
c3 | character varying(42) | | (column_name 'c3')
3004+
Server: loopback
3005+
FDW Options: (schema_name 'import_source', table_name 'x 4')
3006+
3007+
Foreign table "import_dest3.x 5"
3008+
Column | Type | Modifiers | FDW Options
3009+
--------+------+-----------+-------------
3010+
Server: loopback
3011+
FDW Options: (schema_name 'import_source', table_name 'x 5')
3012+
3013+
-- Check LIMIT TO and EXCEPT
3014+
CREATE SCHEMA import_dest4;
3015+
IMPORT FOREIGN SCHEMA import_source LIMIT TO (t1, nonesuch)
3016+
FROM SERVER loopback INTO import_dest4;
3017+
\det+ import_dest4
3018+
List of foreign tables
3019+
Schema | Table | Server | FDW Options | Description
3020+
--------------+-------+----------+------------------------------------------------+-------------
3021+
import_dest4 | t1 | loopback | (schema_name 'import_source', table_name 't1') |
3022+
(1 row)
3023+
3024+
IMPORT FOREIGN SCHEMA import_source EXCEPT (t1, "x 4", nonesuch)
3025+
FROM SERVER loopback INTO import_dest4;
3026+
\det+ import_dest4
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List of foreign tables
3028+
Schema | Table | Server | FDW Options | Description
3029+
--------------+-------+----------+-------------------------------------------------+-------------
3030+
import_dest4 | t1 | loopback | (schema_name 'import_source', table_name 't1') |
3031+
import_dest4 | t2 | loopback | (schema_name 'import_source', table_name 't2') |
3032+
import_dest4 | t3 | loopback | (schema_name 'import_source', table_name 't3') |
3033+
import_dest4 | x 5 | loopback | (schema_name 'import_source', table_name 'x 5') |
3034+
(4 rows)
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3036+
-- Assorted error cases
3037+
IMPORT FOREIGN SCHEMA import_source FROM SERVER loopback INTO import_dest4;
3038+
ERROR: relation "t1" already exists
3039+
CONTEXT: importing foreign table "t1"
3040+
IMPORT FOREIGN SCHEMA nonesuch FROM SERVER loopback INTO import_dest4;
3041+
ERROR: schema "nonesuch" is not present on foreign server "loopback"
3042+
IMPORT FOREIGN SCHEMA nonesuch FROM SERVER loopback INTO notthere;
3043+
ERROR: schema "notthere" does not exist
3044+
IMPORT FOREIGN SCHEMA nonesuch FROM SERVER nowhere INTO notthere;
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ERROR: server "nowhere" does not exist
3046+
-- Check case of a type present only on the remote server.
3047+
-- We can fake this by dropping the type locally in our transaction.
3048+
CREATE TYPE "Colors" AS ENUM ('red', 'green', 'blue');
3049+
CREATE TABLE import_source.t5 (c1 int, c2 text collate "C", "Col" "Colors");
3050+
CREATE SCHEMA import_dest5;
3051+
BEGIN;
3052+
DROP TYPE "Colors" CASCADE;
3053+
NOTICE: drop cascades to table import_source.t5 column Col
3054+
IMPORT FOREIGN SCHEMA import_source LIMIT TO (t5)
3055+
FROM SERVER loopback INTO import_dest5; -- ERROR
3056+
ERROR: type "public.Colors" does not exist
3057+
LINE 4: "Col" public."Colors" OPTIONS (column_name 'Col')
3058+
^
3059+
QUERY: CREATE FOREIGN TABLE t5 (
3060+
c1 integer OPTIONS (column_name 'c1'),
3061+
c2 text OPTIONS (column_name 'c2') COLLATE pg_catalog."C",
3062+
"Col" public."Colors" OPTIONS (column_name 'Col')
3063+
) SERVER loopback
3064+
OPTIONS (schema_name 'import_source', table_name 't5');
3065+
CONTEXT: importing foreign table "t5"
3066+
ROLLBACK;

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