mirror of
https://github.com/postgres/postgres.git
synced 2025-12-21 05:21:08 +03:00
578b229718
Previously tables declared WITH OIDS, including a significant fraction of the catalog tables, stored the oid column not as a normal column, but as part of the tuple header. This special column was not shown by default, which was somewhat odd, as it's often (consider e.g. pg_class.oid) one of the more important parts of a row. Neither pg_dump nor COPY included the contents of the oid column by default. The fact that the oid column was not an ordinary column necessitated a significant amount of special case code to support oid columns. That already was painful for the existing, but upcoming work aiming to make table storage pluggable, would have required expanding and duplicating that "specialness" significantly. WITH OIDS has been deprecated since 2005 (commit ff02d0a05280e0). Remove it. Removing includes: - CREATE TABLE and ALTER TABLE syntax for declaring the table to be WITH OIDS has been removed (WITH (oids[ = true]) will error out) - pg_dump does not support dumping tables declared WITH OIDS and will issue a warning when dumping one (and ignore the oid column). - restoring an pg_dump archive with pg_restore will warn when restoring a table with oid contents (and ignore the oid column) - COPY will refuse to load binary dump that includes oids. - pg_upgrade will error out when encountering tables declared WITH OIDS, they have to be altered to remove the oid column first. - Functionality to access the oid of the last inserted row (like plpgsql's RESULT_OID, spi's SPI_lastoid, ...) has been removed. The syntax for declaring a table WITHOUT OIDS (or WITH (oids = false) for CREATE TABLE) is still supported. While that requires a bit of support code, it seems unnecessary to break applications / dumps that do not use oids, and are explicit about not using them. The biggest user of WITH OID columns was postgres' catalog. This commit changes all 'magic' oid columns to be columns that are normally declared and stored. To reduce unnecessary query breakage all the newly added columns are still named 'oid', even if a table's column naming scheme would indicate 'reloid' or such. This obviously requires adapting a lot code, mostly replacing oid access via HeapTupleGetOid() with access to the underlying Form_pg_*->oid column. The bootstrap process now assigns oids for all oid columns in genbki.pl that do not have an explicit value (starting at the largest oid previously used), only oids assigned later by oids will be above FirstBootstrapObjectId. As the oid column now is a normal column the special bootstrap syntax for oids has been removed. Oids are not automatically assigned during insertion anymore, all backend code explicitly assigns oids with GetNewOidWithIndex(). For the rare case that insertions into the catalog via SQL are called for the new pg_nextoid() function can be used (which only works on catalog tables). The fact that oid columns on system tables are now normal columns means that they will be included in the set of columns expanded by * (i.e. SELECT * FROM pg_class will now include the table's oid, previously it did not). It'd not technically be hard to hide oid column by default, but that'd mean confusing behavior would either have to be carried forward forever, or it'd cause breakage down the line. While it's not unlikely that further adjustments are needed, the scope/invasiveness of the patch makes it worthwhile to get merge this now. It's painful to maintain externally, too complicated to commit after the code code freeze, and a dependency of a number of other patches. Catversion bump, for obvious reasons. Author: Andres Freund, with contributions by John Naylor Discussion: https://postgr.es/m/20180930034810.ywp2c7awz7opzcfr@alap3.anarazel.de
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* relcache.h
|
|
* Relation descriptor cache definitions.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* src/include/utils/relcache.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef RELCACHE_H
|
|
#define RELCACHE_H
|
|
|
|
#include "access/tupdesc.h"
|
|
#include "nodes/bitmapset.h"
|
|
|
|
|
|
/*
|
|
* Name of relcache init file(s), used to speed up backend startup
|
|
*/
|
|
#define RELCACHE_INIT_FILENAME "pg_internal.init"
|
|
|
|
typedef struct RelationData *Relation;
|
|
|
|
/* ----------------
|
|
* RelationPtr is used in the executor to support index scans
|
|
* where we have to keep track of several index relations in an
|
|
* array. -cim 9/10/89
|
|
* ----------------
|
|
*/
|
|
typedef Relation *RelationPtr;
|
|
|
|
/*
|
|
* Routines to open (lookup) and close a relcache entry
|
|
*/
|
|
extern Relation RelationIdGetRelation(Oid relationId);
|
|
extern void RelationClose(Relation relation);
|
|
|
|
/*
|
|
* Routines to compute/retrieve additional cached information
|
|
*/
|
|
extern List *RelationGetFKeyList(Relation relation);
|
|
extern List *RelationGetIndexList(Relation relation);
|
|
extern List *RelationGetStatExtList(Relation relation);
|
|
extern Oid RelationGetPrimaryKeyIndex(Relation relation);
|
|
extern Oid RelationGetReplicaIndex(Relation relation);
|
|
extern List *RelationGetIndexExpressions(Relation relation);
|
|
extern List *RelationGetIndexPredicate(Relation relation);
|
|
|
|
typedef enum IndexAttrBitmapKind
|
|
{
|
|
INDEX_ATTR_BITMAP_HOT,
|
|
INDEX_ATTR_BITMAP_PROJ,
|
|
INDEX_ATTR_BITMAP_KEY,
|
|
INDEX_ATTR_BITMAP_PRIMARY_KEY,
|
|
INDEX_ATTR_BITMAP_IDENTITY_KEY
|
|
} IndexAttrBitmapKind;
|
|
|
|
extern Bitmapset *RelationGetIndexAttrBitmap(Relation relation,
|
|
IndexAttrBitmapKind keyAttrs);
|
|
|
|
extern void RelationGetExclusionInfo(Relation indexRelation,
|
|
Oid **operators,
|
|
Oid **procs,
|
|
uint16 **strategies);
|
|
|
|
extern void RelationSetIndexList(Relation relation,
|
|
List *indexIds);
|
|
|
|
extern void RelationInitIndexAccessInfo(Relation relation);
|
|
|
|
/* caller must include pg_publication.h */
|
|
struct PublicationActions;
|
|
extern struct PublicationActions *GetRelationPublicationActions(Relation relation);
|
|
|
|
/*
|
|
* Routines to support ereport() reports of relation-related errors
|
|
*/
|
|
extern int errtable(Relation rel);
|
|
extern int errtablecol(Relation rel, int attnum);
|
|
extern int errtablecolname(Relation rel, const char *colname);
|
|
extern int errtableconstraint(Relation rel, const char *conname);
|
|
|
|
/*
|
|
* Routines for backend startup
|
|
*/
|
|
extern void RelationCacheInitialize(void);
|
|
extern void RelationCacheInitializePhase2(void);
|
|
extern void RelationCacheInitializePhase3(void);
|
|
|
|
/*
|
|
* Routine to create a relcache entry for an about-to-be-created relation
|
|
*/
|
|
extern Relation RelationBuildLocalRelation(const char *relname,
|
|
Oid relnamespace,
|
|
TupleDesc tupDesc,
|
|
Oid relid,
|
|
Oid relfilenode,
|
|
Oid reltablespace,
|
|
bool shared_relation,
|
|
bool mapped_relation,
|
|
char relpersistence,
|
|
char relkind);
|
|
|
|
/*
|
|
* Routine to manage assignment of new relfilenode to a relation
|
|
*/
|
|
extern void RelationSetNewRelfilenode(Relation relation, char persistence,
|
|
TransactionId freezeXid, MultiXactId minmulti);
|
|
|
|
/*
|
|
* Routines for flushing/rebuilding relcache entries in various scenarios
|
|
*/
|
|
extern void RelationForgetRelation(Oid rid);
|
|
|
|
extern void RelationCacheInvalidateEntry(Oid relationId);
|
|
|
|
extern void RelationCacheInvalidate(void);
|
|
|
|
extern void RelationCloseSmgrByOid(Oid relationId);
|
|
|
|
extern void AtEOXact_RelationCache(bool isCommit);
|
|
extern void AtEOSubXact_RelationCache(bool isCommit, SubTransactionId mySubid,
|
|
SubTransactionId parentSubid);
|
|
|
|
/*
|
|
* Routines to help manage rebuilding of relcache init files
|
|
*/
|
|
extern bool RelationIdIsInInitFile(Oid relationId);
|
|
extern void RelationCacheInitFilePreInvalidate(void);
|
|
extern void RelationCacheInitFilePostInvalidate(void);
|
|
extern void RelationCacheInitFileRemove(void);
|
|
|
|
/* should be used only by relcache.c and catcache.c */
|
|
extern bool criticalRelcachesBuilt;
|
|
|
|
/* should be used only by relcache.c and postinit.c */
|
|
extern bool criticalSharedRelcachesBuilt;
|
|
|
|
#endif /* RELCACHE_H */
|