relcache.h

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/*-------------------------------------------------------------------------
 *
 * relcache.h
 *    Relation descriptor cache definitions.
 *
 *
 * Portions Copyright (c) 1996-2020, 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 "postgres.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 *RelationGetDummyIndexExpressions(Relation relation);
extern List *RelationGetIndexPredicate(Relation relation);
extern Datum *RelationGetIndexRawAttOptions(Relation relation);
extern bytea **RelationGetIndexAttOptions(Relation relation, bool copy);

typedef enum IndexAttrBitmapKind
{
    INDEX_ATTR_BITMAP_ALL,
    INDEX_ATTR_BITMAP_KEY,
    INDEX_ATTR_BITMAP_PRIMARY_KEY,
    INDEX_ATTR_BITMAP_IDENTITY_KEY
} IndexAttrBitmapKind;

extern Bitmapset *RelationGetIndexAttrBitmap(Relation relation,
                                             IndexAttrBitmapKind attrKind);

extern void RelationGetExclusionInfo(Relation indexRelation,
                                     Oid **operators,
                                     Oid **procs,
                                     uint16 **strategies);

extern void RelationInitIndexAccessInfo(Relation relation);

/* caller must include pg_publication.h */
struct PublicationActions;
extern struct PublicationActions *GetRelationPublicationActions(Relation relation);

extern void RelationInitTableAccessMethod(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 accessmtd,
                                           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);

/*
 * 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 */