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Fix up foreign-key mechanism so that there is a sound semantic basis for the

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equality checks it applies, instead of a random dependence on whatever
operators might be named "=".  The equality operators will now be selected
from the opfamily of the unique index that the FK constraint depends on to
enforce uniqueness of the referenced columns; therefore they are certain to be
consistent with that index's notion of equality.  Among other things this
should fix the problem noted awhile back that pg_dump may fail for foreign-key
constraints on user-defined types when the required operators aren't in the
search path.  This also means that the former warning condition about "foreign
key constraint will require costly sequential scans" is gone: if the
comparison condition isn't indexable then we'll reject the constraint
entirely. All per past discussions.

Along the way, make the RI triggers look into pg_constraint for their
information, instead of using pg_trigger.tgargs; and get rid of the always
error-prone fixed-size string buffers in ri_triggers.c in favor of building up
the RI queries in StringInfo buffers.

initdb forced due to columns added to pg_constraint and pg_trigger.
This commit is contained in:
Tom Lane
2007-02-14 01:58:58 +00:00
parent 65e2f55031
commit 7bddca3450
33 changed files with 1731 additions and 1665 deletions
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75
src/include/utils/syscache.h
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@@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/syscache.h,v 1.67 2007/01/05 22:19:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/syscache.h,v 1.68 2007/02/14 01:58:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -28,42 +28,43 @@
* Keep them in alphabetical order.
*/
#define AGGFNOID 0
#define AMNAME 1
#define AMOID 2
#define AMOPOPID 3
#define AMOPSTRATEGY 4
#define AMPROCNUM 5
#define ATTNAME 6
#define ATTNUM 7
#define AUTHMEMMEMROLE 8
#define AUTHMEMROLEMEM 9
#define AUTHNAME 10
#define AUTHOID 11
#define CASTSOURCETARGET 12
#define CLAAMNAMENSP 13
#define CLAOID 14
#define CONDEFAULT 15
#define CONNAMENSP 16
#define CONOID 17
#define DATABASEOID 18
#define INDEXRELID 19
#define LANGNAME 20
#define LANGOID 21
#define NAMESPACENAME 22
#define NAMESPACEOID 23
#define OPERNAMENSP 24
#define OPEROID 25
#define OPFAMILYAMNAMENSP 26
#define OPFAMILYOID 27
#define PROCNAMEARGSNSP 28
#define PROCOID 29
#define RELNAMENSP 30
#define RELOID 31
#define RULERELNAME 32
#define STATRELATT 33
#define TYPENAMENSP 34
#define TYPEOID 35
#define AGGFNOID 0
#define AMNAME 1
#define AMOID 2
#define AMOPOPID 3
#define AMOPSTRATEGY 4
#define AMPROCNUM 5
#define ATTNAME 6
#define ATTNUM 7
#define AUTHMEMMEMROLE 8
#define AUTHMEMROLEMEM 9
#define AUTHNAME 10
#define AUTHOID 11
#define CASTSOURCETARGET 12
#define CLAAMNAMENSP 13
#define CLAOID 14
#define CONDEFAULT 15
#define CONNAMENSP 16
#define CONSTROID 17
#define CONVOID 18
#define DATABASEOID 19
#define INDEXRELID 20
#define LANGNAME 21
#define LANGOID 22
#define NAMESPACENAME 23
#define NAMESPACEOID 24
#define OPERNAMENSP 25
#define OPEROID 26
#define OPFAMILYAMNAMENSP 27
#define OPFAMILYOID 28
#define PROCNAMEARGSNSP 29
#define PROCOID 30
#define RELNAMENSP 31
#define RELOID 32
#define RULERELNAME 33
#define STATRELATT 34
#define TYPENAMENSP 35
#define TYPEOID 36
extern void InitCatalogCache(void);
extern void InitCatalogCachePhase2(void);