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Add system catalog columns pg_constraint.conindid and pg_trigger.tgconstrindid.

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conindid is the index supporting a constraint.  We can use this not only for
unique/primary-key constraints, but also foreign-key constraints, which
depend on the unique index that constrains the referenced columns.
tgconstrindid is just copied from the constraint's conindid field, or is
zero for triggers not associated with constraints.

This is mainly intended as infrastructure for upcoming patches, but it has
some virtue in itself, since it exposes a relationship that you formerly
had to grovel in pg_depend to determine.  I simplified one information_schema
view accordingly.  (There is a pg_dump query that could also use conindid,
but I left it alone because it wasn't clear it'd get any faster.)
This commit is contained in:
Tom Lane
2009-07-28 02:56:31 +00:00
parent 36942504fc
commit c1b9ec24ef
15 changed files with 120 additions and 78 deletions
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5
src/include/commands/trigger.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.73 2009/06/11 14:49:11 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.74 2009/07/28 02:56:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -104,7 +104,8 @@ extern PGDLLIMPORT int SessionReplicationRole;
#define TRIGGER_FIRES_ON_REPLICA 'R'
#define TRIGGER_DISABLED 'D'
extern Oid CreateTrigger(CreateTrigStmt *stmt, Oid constraintOid,
extern Oid CreateTrigger(CreateTrigStmt *stmt,
Oid constraintOid, Oid indexOid,
bool checkPermissions);
extern void DropTrigger(Oid relid, const char *trigname,