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Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN

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Fabrízio de Royes Mello, reviewed by Payal Singh, Alvaro Herrera and
Michael Paquier.
This commit is contained in:
Andrew Dunstan
2015-07-29 21:30:00 -04:00
parent 632cd9f892
commit 2cd40adb85
5 changed files with 182 additions and 18 deletions
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89
src/test/regress/expected/alter_table.out
View File

@ -2605,3 +2605,92 @@ ALTER TABLE logged1 SET UNLOGGED; -- silently do nothing
DROP TABLE logged3;
DROP TABLE logged2;
DROP TABLE logged1;
-- test ADD COLUMN IF NOT EXISTS
CREATE TABLE test_add_column(c1 integer);
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
ALTER TABLE test_add_column
ADD COLUMN c2 integer;
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
ALTER TABLE test_add_column
ADD COLUMN c2 integer; -- fail because c2 already exists
ERROR: column "c2" of relation "test_add_column" already exists
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer; -- skipping because c2 already exists
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
ALTER TABLE test_add_column
ADD COLUMN c2 integer, -- fail because c2 already exists
ADD COLUMN c3 integer;
ERROR: column "c2" of relation "test_add_column" already exists
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN c3 integer; -- fail because c3 already exists
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
c3 | integer |
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer; -- skipping because c3 already exists
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
NOTICE: column "c3" of relation "test_add_column" already exists, skipping
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
c3 | integer |
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer, -- skipping because c3 already exists
ADD COLUMN c4 integer;
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
NOTICE: column "c3" of relation "test_add_column" already exists, skipping
\d test_add_column
Table "public.test_add_column"
Column | Type | Modifiers
--------+---------+-----------
c1 | integer |
c2 | integer |
c3 | integer |
c4 | integer |
DROP TABLE test_add_column;

31
src/test/regress/sql/alter_table.sql
View File

@ -1724,3 +1724,34 @@ ALTER TABLE logged1 SET UNLOGGED; -- silently do nothing
DROP TABLE logged3;
DROP TABLE logged2;
DROP TABLE logged1;
-- test ADD COLUMN IF NOT EXISTS
CREATE TABLE test_add_column(c1 integer);
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN c2 integer;
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN c2 integer; -- fail because c2 already exists
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer; -- skipping because c2 already exists
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN c2 integer, -- fail because c2 already exists
ADD COLUMN c3 integer;
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN c3 integer; -- fail because c3 already exists
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer; -- skipping because c3 already exists
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer, -- skipping because c3 already exists
ADD COLUMN c4 integer;
\d test_add_column
DROP TABLE test_add_column;