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ALTER TABLE rewrite. New cool stuff:

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* ALTER ... ADD COLUMN with defaults and NOT NULL constraints works per SQL
spec.  A default is implemented by rewriting the table with the new value
stored in each row.

* ALTER COLUMN TYPE.  You can change a column's datatype to anything you
want, so long as you can specify how to convert the old value.  Rewrites
the table.  (Possible future improvement: optimize no-op conversions such
as varchar(N) to varchar(N+1).)

* Multiple ALTER actions in a single ALTER TABLE command.  You can perform
any number of column additions, type changes, and constraint additions with
only one pass over the table contents.

Basic documentation provided in ALTER TABLE ref page, but some more docs
work is needed.

Original patch from Rod Taylor, additional work from Tom Lane.
This commit is contained in:
Tom Lane
2004-05-05 04:48:48 +00:00
parent 3e3cb0a14a
commit 077db40fa1
30 changed files with 3302 additions and 1906 deletions
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4
src/include/utils/builtins.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.236 2004/04/01 21:28:46 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.237 2004/05/05 04:48:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -463,9 +463,11 @@ extern Datum pg_get_viewdef_name(PG_FUNCTION_ARGS);
extern Datum pg_get_viewdef_name_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_indexdef(PG_FUNCTION_ARGS);
extern Datum pg_get_indexdef_ext(PG_FUNCTION_ARGS);
extern char *pg_get_indexdef_string(Oid indexrelid);
extern Datum pg_get_triggerdef(PG_FUNCTION_ARGS);
extern Datum pg_get_constraintdef(PG_FUNCTION_ARGS);
extern Datum pg_get_constraintdef_ext(PG_FUNCTION_ARGS);
extern char *pg_get_constraintdef_string(Oid constraintId);
extern Datum pg_get_userbyid(PG_FUNCTION_ARGS);
extern Datum pg_get_expr(PG_FUNCTION_ARGS);
extern Datum pg_get_expr_ext(PG_FUNCTION_ARGS);