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ALTER TABLE ... ADD/DROPS INHERIT (actually INHERIT / NO INHERIT)

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Open items:

There were a few tangentially related issues that have come up that I think
are TODOs. I'm likely to tackle one or two of these next so I'm interested in
hearing feedback on them as well.

. Constraints currently do not know anything about inheritance. Tom suggested
  adding a coninhcount and conislocal like attributes have to track their
  inheritance status.

. Foreign key constraints currently do not get copied to new children (and
  therefore my code doesn't verify them). I don't think it would be hard to
  add them and treat them like CHECK constraints.

. No constraints at all are copied to tables defined with LIKE. That makes it
  hard to use LIKE to define new partitions. The standard defines LIKE and
  specifically says it does not copy constraints. But the standard already has
  an option called INCLUDING DEFAULTS; we could always define a non-standard
  extension LIKE table INCLUDING CONSTRAINTS that gives the user the option to
  request a copy including constraints.

. Personally, I think the whole attislocal thing is bunk. The decision about
  whether to drop a column from children tables or not is something that
  should be up to the user and trying to DWIM based on whether there was ever
  a local definition or the column was acquired purely through inheritance is
  hardly ever going to match up with user expectations.

. And of course there's the whole unique and primary key constraint issue. I
  think to get any traction at all on this you have a prerequisite of a real
  partitioned table implementation where the system knows what the partition
  key is so it can recognize when it's a leading part of an index key.

Greg Stark
This commit is contained in:
Bruce Momjian
2006-07-02 01:58:36 +00:00
parent 08ccdf020e
commit 8c092781f4
8 changed files with 828 additions and 75 deletions
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7
src/include/nodes/parsenodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.312 2006/06/27 03:43:20 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.313 2006/07/02 01:58:36 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -874,7 +874,9 @@ typedef enum AlterTableType
AT_EnableTrigAll, /* ENABLE TRIGGER ALL */
AT_DisableTrigAll, /* DISABLE TRIGGER ALL */
AT_EnableTrigUser, /* ENABLE TRIGGER USER */
AT_DisableTrigUser /* DISABLE TRIGGER USER */
AT_DisableTrigUser, /* DISABLE TRIGGER USER */
AT_AddInherits, /* ADD INHERITS parent */
AT_DropInherits /* DROP INHERITS parent */
} AlterTableType;
typedef struct AlterTableCmd /* one subcommand of an ALTER TABLE */
@@ -883,6 +885,7 @@ typedef struct AlterTableCmd /* one subcommand of an ALTER TABLE */
AlterTableType subtype; /* Type of table alteration to apply */
char *name; /* column, constraint, or trigger to act on,
* or new owner or tablespace */
RangeVar *parent; /* Parent table for add/drop inherits */
Node *def; /* definition of new column, column type,
* index, or constraint */
Node *transform; /* transformation expr for ALTER TYPE */