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Change the rules for inherited CHECK constraints to be essentially the same

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as those for inherited columns; that is, it's no longer allowed for a child
table to not have a check constraint matching one that exists on a parent.
This satisfies the principle of least surprise (rows selected from the parent
will always appear to meet its check constraints) and eliminates some
longstanding bogosity in pg_dump, which formerly had to guess about whether
check constraints were really inherited or not.

The implementation involves adding conislocal and coninhcount columns to
pg_constraint (paralleling attislocal and attinhcount in pg_attribute)
and refactoring various ALTER TABLE actions to be more like those for
columns.

Alex Hunsaker, Nikhil Sontakke, Tom Lane
This commit is contained in:
Tom Lane
2008-05-09 23:32:05 +00:00
parent f8df836ae3
commit cd902b331d
25 changed files with 1391 additions and 575 deletions
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6
src/include/nodes/parsenodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.364 2008/04/29 20:44:49 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.365 2008/05/09 23:32:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -892,11 +892,11 @@ typedef enum AlterTableType
AT_AddIndex, /* add index */
AT_ReAddIndex, /* internal to commands/tablecmds.c */
AT_AddConstraint, /* add constraint */
AT_AddConstraintRecurse, /* internal to commands/tablecmds.c */
AT_ProcessedConstraint, /* pre-processed add constraint (local in
* parser/parse_utilcmd.c) */
AT_DropConstraint, /* drop constraint */
AT_DropConstraintQuietly, /* drop constraint, no error/warning (local in
* commands/tablecmds.c) */
AT_DropConstraintRecurse, /* internal to commands/tablecmds.c */
AT_AlterColumnType, /* alter column type */
AT_ChangeOwner, /* change owner */
AT_ClusterOn, /* CLUSTER ON */