mirror of
https://git.postgresql.org/git/postgresql.git
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323 lines
12 KiB
Plaintext
323 lines
12 KiB
Plaintext
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-- sanity check of system catalog
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SELECT attrelid, attname, attidentity FROM pg_attribute WHERE attidentity NOT IN ('', 'a', 'd');
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attrelid | attname | attidentity
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----------+---------+-------------
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(0 rows)
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CREATE TABLE itest1 (a int generated by default as identity, b text);
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CREATE TABLE itest2 (a bigint generated always as identity, b text);
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CREATE TABLE itest3 (a smallint generated by default as identity (start with 7 increment by 5), b text);
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ALTER TABLE itest3 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY; -- error
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ERROR: column "a" of relation "itest3" is already an identity column
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SELECT table_name, column_name, column_default, is_nullable, is_identity, identity_generation, identity_start, identity_increment, identity_maximum, identity_minimum, identity_cycle FROM information_schema.columns WHERE table_name LIKE 'itest_' ORDER BY 1, 2;
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table_name | column_name | column_default | is_nullable | is_identity | identity_generation | identity_start | identity_increment | identity_maximum | identity_minimum | identity_cycle
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------------+-------------+----------------+-------------+-------------+---------------------+----------------+--------------------+---------------------+------------------+----------------
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itest1 | a | | NO | YES | BY DEFAULT | 1 | 1 | 2147483647 | 1 | NO
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itest1 | b | | YES | NO | | | | | | NO
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itest2 | a | | NO | YES | ALWAYS | 1 | 1 | 9223372036854775807 | 1 | NO
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itest2 | b | | YES | NO | | | | | | NO
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itest3 | a | | NO | YES | BY DEFAULT | 7 | 5 | 32767 | 1 | NO
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itest3 | b | | YES | NO | | | | | | NO
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(6 rows)
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-- internal sequences should not be shown here
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SELECT sequence_name FROM information_schema.sequences WHERE sequence_name LIKE 'itest%';
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sequence_name
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---------------
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(0 rows)
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CREATE TABLE itest4 (a int, b text);
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ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY; -- error, requires NOT NULL
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ERROR: column "a" of relation "itest4" must be declared NOT NULL before identity can be added
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ALTER TABLE itest4 ALTER COLUMN a SET NOT NULL;
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ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY; -- ok
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ALTER TABLE itest4 ALTER COLUMN a DROP NOT NULL; -- error, disallowed
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ERROR: column "a" of relation "itest4" is an identity column
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ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY; -- error, already set
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ERROR: column "a" of relation "itest4" is already an identity column
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ALTER TABLE itest4 ALTER COLUMN b ADD GENERATED ALWAYS AS IDENTITY; -- error, wrong data type
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ERROR: identity column type must be smallint, integer, or bigint
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-- for later
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ALTER TABLE itest4 ALTER COLUMN b SET DEFAULT '';
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-- invalid column type
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CREATE TABLE itest_err_1 (a text generated by default as identity);
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ERROR: identity column type must be smallint, integer, or bigint
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-- duplicate identity
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CREATE TABLE itest_err_2 (a int generated always as identity generated by default as identity);
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ERROR: multiple identity specifications for column "a" of table "itest_err_2"
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LINE 1: ...E itest_err_2 (a int generated always as identity generated ...
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^
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-- cannot have default and identity
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CREATE TABLE itest_err_3 (a int default 5 generated by default as identity);
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ERROR: both default and identity specified for column "a" of table "itest_err_3"
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LINE 1: CREATE TABLE itest_err_3 (a int default 5 generated by defau...
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^
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-- cannot combine serial and identity
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CREATE TABLE itest_err_4 (a serial generated by default as identity);
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ERROR: both default and identity specified for column "a" of table "itest_err_4"
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INSERT INTO itest1 DEFAULT VALUES;
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INSERT INTO itest1 DEFAULT VALUES;
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INSERT INTO itest2 DEFAULT VALUES;
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INSERT INTO itest2 DEFAULT VALUES;
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INSERT INTO itest3 DEFAULT VALUES;
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INSERT INTO itest3 DEFAULT VALUES;
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INSERT INTO itest4 DEFAULT VALUES;
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INSERT INTO itest4 DEFAULT VALUES;
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SELECT * FROM itest1;
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a | b
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---+---
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1 |
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2 |
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(2 rows)
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SELECT * FROM itest2;
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a | b
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---+---
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1 |
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2 |
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(2 rows)
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SELECT * FROM itest3;
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a | b
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----+---
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7 |
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12 |
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(2 rows)
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SELECT * FROM itest4;
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a | b
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---+---
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1 |
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2 |
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(2 rows)
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-- OVERRIDING tests
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INSERT INTO itest1 VALUES (10, 'xyz');
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INSERT INTO itest1 OVERRIDING USER VALUE VALUES (10, 'xyz');
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SELECT * FROM itest1;
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a | b
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----+-----
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1 |
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2 |
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10 | xyz
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3 | xyz
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(4 rows)
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INSERT INTO itest2 VALUES (10, 'xyz');
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ERROR: cannot insert into column "a"
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DETAIL: Column "a" is an identity column defined as GENERATED ALWAYS.
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HINT: Use OVERRIDING SYSTEM VALUE to override.
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INSERT INTO itest2 OVERRIDING SYSTEM VALUE VALUES (10, 'xyz');
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SELECT * FROM itest2;
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a | b
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----+-----
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1 |
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2 |
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10 | xyz
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(3 rows)
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-- UPDATE tests
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UPDATE itest1 SET a = 101 WHERE a = 1;
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UPDATE itest1 SET a = DEFAULT WHERE a = 2;
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SELECT * FROM itest1;
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a | b
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-----+-----
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10 | xyz
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3 | xyz
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101 |
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4 |
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(4 rows)
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UPDATE itest2 SET a = 101 WHERE a = 1;
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ERROR: column "a" can only be updated to DEFAULT
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DETAIL: Column "a" is an identity column defined as GENERATED ALWAYS.
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UPDATE itest2 SET a = DEFAULT WHERE a = 2;
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SELECT * FROM itest2;
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a | b
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----+-----
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1 |
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10 | xyz
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3 |
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(3 rows)
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-- DROP IDENTITY tests
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ALTER TABLE itest4 ALTER COLUMN a DROP IDENTITY;
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ALTER TABLE itest4 ALTER COLUMN a DROP IDENTITY; -- error
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ERROR: column "a" of relation "itest4" is not an identity column
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ALTER TABLE itest4 ALTER COLUMN a DROP IDENTITY IF EXISTS; -- noop
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NOTICE: column "a" of relation "itest4" is not an identity column, skipping
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INSERT INTO itest4 DEFAULT VALUES; -- fails because NOT NULL is not dropped
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ERROR: null value in column "a" violates not-null constraint
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DETAIL: Failing row contains (null, ).
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ALTER TABLE itest4 ALTER COLUMN a DROP NOT NULL;
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INSERT INTO itest4 DEFAULT VALUES;
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SELECT * FROM itest4;
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a | b
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---+---
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1 |
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2 |
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(3 rows)
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-- check that sequence is removed
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SELECT sequence_name FROM itest4_a_seq;
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ERROR: relation "itest4_a_seq" does not exist
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LINE 1: SELECT sequence_name FROM itest4_a_seq;
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^
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-- test views
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CREATE TABLE itest10 (a int generated by default as identity, b text);
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CREATE TABLE itest11 (a int generated always as identity, b text);
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CREATE VIEW itestv10 AS SELECT * FROM itest10;
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CREATE VIEW itestv11 AS SELECT * FROM itest11;
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INSERT INTO itestv10 DEFAULT VALUES;
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INSERT INTO itestv10 DEFAULT VALUES;
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INSERT INTO itestv11 DEFAULT VALUES;
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INSERT INTO itestv11 DEFAULT VALUES;
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SELECT * FROM itestv10;
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a | b
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---+---
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1 |
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2 |
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(2 rows)
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SELECT * FROM itestv11;
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a | b
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---+---
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1 |
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2 |
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(2 rows)
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INSERT INTO itestv10 VALUES (10, 'xyz');
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INSERT INTO itestv10 OVERRIDING USER VALUE VALUES (11, 'xyz');
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SELECT * FROM itestv10;
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a | b
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----+-----
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1 |
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2 |
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10 | xyz
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3 | xyz
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(4 rows)
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INSERT INTO itestv11 VALUES (10, 'xyz');
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ERROR: cannot insert into column "a"
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DETAIL: Column "a" is an identity column defined as GENERATED ALWAYS.
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HINT: Use OVERRIDING SYSTEM VALUE to override.
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INSERT INTO itestv11 OVERRIDING SYSTEM VALUE VALUES (11, 'xyz');
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SELECT * FROM itestv11;
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a | b
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----+-----
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1 |
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2 |
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11 | xyz
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(3 rows)
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-- various ALTER COLUMN tests
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-- fail, not allowed for identity columns
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ALTER TABLE itest1 ALTER COLUMN a SET DEFAULT 1;
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ERROR: column "a" of relation "itest1" is an identity column
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-- fail, not allowed, already has a default
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CREATE TABLE itest5 (a serial, b text);
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ALTER TABLE itest5 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;
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ERROR: column "a" of relation "itest5" already has a default value
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ALTER TABLE itest3 ALTER COLUMN a TYPE int;
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SELECT seqtypid::regtype FROM pg_sequence WHERE seqrelid = 'itest3_a_seq'::regclass;
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seqtypid
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----------
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integer
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(1 row)
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\d itest3
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Table "public.itest3"
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Column | Type | Collation | Nullable | Default
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--------+---------+-----------+----------+----------------------------------
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a | integer | | not null | generated by default as identity
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b | text | | |
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ALTER TABLE itest3 ALTER COLUMN a TYPE text; -- error
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ERROR: identity column type must be smallint, integer, or bigint
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-- ALTER COLUMN ... SET
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CREATE TABLE itest6 (a int GENERATED ALWAYS AS IDENTITY, b text);
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INSERT INTO itest6 DEFAULT VALUES;
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ALTER TABLE itest6 ALTER COLUMN a SET GENERATED BY DEFAULT SET INCREMENT BY 2 SET START WITH 100 RESTART;
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INSERT INTO itest6 DEFAULT VALUES;
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INSERT INTO itest6 DEFAULT VALUES;
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SELECT * FROM itest6;
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a | b
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-----+---
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1 |
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100 |
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102 |
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(3 rows)
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SELECT table_name, column_name, is_identity, identity_generation FROM information_schema.columns WHERE table_name = 'itest6';
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table_name | column_name | is_identity | identity_generation
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------------+-------------+-------------+---------------------
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itest6 | a | YES | BY DEFAULT
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itest6 | b | NO |
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(2 rows)
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ALTER TABLE itest6 ALTER COLUMN b SET INCREMENT BY 2; -- fail, not identity
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ERROR: column "b" of relation "itest6" is not an identity column
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-- prohibited direct modification of sequence
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ALTER SEQUENCE itest6_a_seq OWNED BY NONE;
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ERROR: cannot change ownership of identity sequence
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DETAIL: Sequence "itest6_a_seq" is linked to table "itest6".
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-- inheritance
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CREATE TABLE itest7 (a int GENERATED ALWAYS AS IDENTITY);
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INSERT INTO itest7 DEFAULT VALUES;
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SELECT * FROM itest7;
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a
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---
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1
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(1 row)
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-- identity property is not inherited
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CREATE TABLE itest7a (b text) INHERITS (itest7);
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-- make column identity in child table
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CREATE TABLE itest7b (a int);
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CREATE TABLE itest7c (a int GENERATED ALWAYS AS IDENTITY) INHERITS (itest7b);
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NOTICE: merging column "a" with inherited definition
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INSERT INTO itest7c DEFAULT VALUES;
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SELECT * FROM itest7c;
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a
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---
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1
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(1 row)
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CREATE TABLE itest7d (a int not null);
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CREATE TABLE itest7e () INHERITS (itest7d);
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ALTER TABLE itest7d ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;
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ALTER TABLE itest7d ADD COLUMN b int GENERATED ALWAYS AS IDENTITY; -- error
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ERROR: cannot recursively add identity column to table that has child tables
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SELECT table_name, column_name, is_nullable, is_identity, identity_generation FROM information_schema.columns WHERE table_name LIKE 'itest7%' ORDER BY 1, 2;
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table_name | column_name | is_nullable | is_identity | identity_generation
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------------+-------------+-------------+-------------+---------------------
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itest7 | a | NO | YES | ALWAYS
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itest7a | a | NO | NO |
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itest7a | b | YES | NO |
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itest7b | a | YES | NO |
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itest7c | a | NO | YES | ALWAYS
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itest7d | a | NO | YES | ALWAYS
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itest7e | a | NO | NO |
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(7 rows)
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-- These ALTER TABLE variants will not recurse.
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ALTER TABLE itest7 ALTER COLUMN a SET GENERATED BY DEFAULT;
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ALTER TABLE itest7 ALTER COLUMN a RESTART;
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ALTER TABLE itest7 ALTER COLUMN a DROP IDENTITY;
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-- privileges
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CREATE USER regress_user1;
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CREATE TABLE itest8 (a int GENERATED ALWAYS AS IDENTITY, b text);
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GRANT SELECT, INSERT ON itest8 TO regress_user1;
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SET ROLE regress_user1;
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INSERT INTO itest8 DEFAULT VALUES;
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SELECT * FROM itest8;
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a | b
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---+---
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1 |
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(1 row)
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RESET ROLE;
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DROP TABLE itest8;
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DROP USER regress_user1;
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