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/*-------------------------------------------------------------------------
*
* rel.h
* POSTGRES relation descriptor (a/k/a relcache entry) definitions.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.77 2004/08/28 20:31:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef REL_H
#define REL_H
#include "access/tupdesc.h"
#include "catalog/pg_am.h"
#include "catalog/pg_class.h"
#include "catalog/pg_index.h"
#include "rewrite/prs2lock.h"
#include "storage/block.h"
#include "storage/relfilenode.h"
/*
* LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
* to declare them here so we can have a LockInfoData field in a Relation.
*/
typedef struct LockRelId
{
Oid relId; /* a relation identifier */
Oid dbId; /* a database identifier */
} LockRelId;
typedef struct LockInfoData
{
LockRelId lockRelId;
} LockInfoData;
typedef LockInfoData *LockInfo;
/*
* Likewise, this struct really belongs to trigger.h, but for convenience
* we put it here.
*/
typedef struct Trigger
{
Oid tgoid; /* OID of trigger (pg_trigger row) */
/* Remaining fields are copied from pg_trigger, see pg_trigger.h */
char *tgname;
Oid tgfoid;
int16 tgtype;
bool tgenabled;
bool tgisconstraint;
Oid tgconstrrelid;
bool tgdeferrable;
bool tginitdeferred;
int16 tgnargs;
int16 tgattr[FUNC_MAX_ARGS];
char **tgargs;
} Trigger;
typedef struct TriggerDesc
{
/*
* Index data to identify which triggers are which. Since each
* trigger can appear in more than one class, for each class we
* provide a list of integer indexes into the triggers array.
*/
#define TRIGGER_NUM_EVENT_CLASSES 3
uint16 n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
uint16 n_before_row[TRIGGER_NUM_EVENT_CLASSES];
uint16 n_after_row[TRIGGER_NUM_EVENT_CLASSES];
uint16 n_after_statement[TRIGGER_NUM_EVENT_CLASSES];
int *tg_before_statement[TRIGGER_NUM_EVENT_CLASSES];
int *tg_before_row[TRIGGER_NUM_EVENT_CLASSES];
int *tg_after_row[TRIGGER_NUM_EVENT_CLASSES];
int *tg_after_statement[TRIGGER_NUM_EVENT_CLASSES];
/* The actual array of triggers is here */
Trigger *triggers;
int numtriggers;
} TriggerDesc;
/*
* Same for the statistics collector data in Relation and scan data.
*/
typedef struct PgStat_Info
{
void *tabentry;
bool no_stats;
bool heap_scan_counted;
bool index_scan_counted;
} PgStat_Info;
/*
* Here are the contents of a relation cache entry.
*/
typedef struct RelationData
{
RelFileNode rd_node; /* relation physical identifier */
/* use "struct" here to avoid needing to include smgr.h: */
struct SMgrRelationData *rd_smgr; /* cached file handle, or NULL */
BlockNumber rd_targblock; /* current insertion target block, or
* InvalidBlockNumber */
int rd_refcnt; /* reference count */
bool rd_istemp; /* rel uses the local buffer mgr */
bool rd_isnailed; /* rel is nailed in cache */
bool rd_isvalid; /* relcache entry is valid */
char rd_indexvalid; /* state of rd_indexlist: 0 = not valid,
* 1 = valid, 2 = temporarily forced */
TransactionId rd_createxact; /* rel was created in current xact */
/*
* rd_createxact is the XID of the highest subtransaction the rel has
* survived into; or zero if the rel was not created in the current
* transaction. This should be relied on only for optimization purposes;
* it is possible for new-ness to be "forgotten" (eg, after CLUSTER).
*/
Form_pg_class rd_rel; /* RELATION tuple */
TupleDesc rd_att; /* tuple descriptor */
Oid rd_id; /* relation's object id */
List *rd_indexlist; /* list of OIDs of indexes on relation */
LockInfoData rd_lockInfo; /* lock mgr's info for locking relation */
RuleLock *rd_rules; /* rewrite rules */
MemoryContext rd_rulescxt; /* private memory cxt for rd_rules, if any */
TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */
/* These are non-NULL only for an index relation: */
Form_pg_index rd_index; /* pg_index tuple describing this index */
struct HeapTupleData *rd_indextuple; /* all of pg_index tuple */
/* "struct HeapTupleData *" avoids need to include htup.h here */
Form_pg_am rd_am; /* pg_am tuple for index's AM */
/*
* index access support info (used only for an index relation)
*
* Note: only default operators and support procs for each opclass are
* cached, namely those with subtype zero. The arrays are indexed by
* strategy or support number, which is a sufficient identifier given
* that restriction.
*/
MemoryContext rd_indexcxt; /* private memory cxt for this stuff */
Oid *rd_operator; /* OIDs of index operators */
RegProcedure *rd_support; /* OIDs of support procedures */
struct FmgrInfo *rd_supportinfo; /* lookup info for support
* procedures */
/* "struct FmgrInfo" avoids need to include fmgr.h here */
List *rd_indexprs; /* index expression trees, if any */
List *rd_indpred; /* index predicate tree, if any */
/* statistics collection area */
PgStat_Info pgstat_info;
} RelationData;
typedef 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;
/*
* RelationIsValid
* True iff relation descriptor is valid.
*/
#define RelationIsValid(relation) PointerIsValid(relation)
#define InvalidRelation ((Relation) NULL)
/*
* RelationHasReferenceCountZero
* True iff relation reference count is zero.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationHasReferenceCountZero(relation) \
((bool)((relation)->rd_refcnt == 0))
/*
* RelationGetForm
* Returns pg_class tuple for a relation.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationGetForm(relation) ((relation)->rd_rel)
/*
* RelationGetRelid
* Returns the OID of the relation
*/
#define RelationGetRelid(relation) ((relation)->rd_id)
/*
* RelationGetNumberOfAttributes
* Returns the number of attributes in a relation.
*/
#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
/*
* RelationGetDescr
* Returns tuple descriptor for a relation.
*/
#define RelationGetDescr(relation) ((relation)->rd_att)
/*
* RelationGetRelationName
* Returns the rel's name.
*
* Note that the name is only unique within the containing namespace.
*/
#define RelationGetRelationName(relation) \
(NameStr((relation)->rd_rel->relname))
/*
* RelationGetNamespace
* Returns the rel's namespace OID.
*/
#define RelationGetNamespace(relation) \
((relation)->rd_rel->relnamespace)
/*
* RELATION_IS_LOCAL
* If a rel is either temp or newly created in the current transaction,
* it can be assumed to be visible only to the current backend.
*
* Beware of multiple eval of argument
*/
#define RELATION_IS_LOCAL(relation) \
((relation)->rd_istemp || TransactionIdIsValid((relation)->rd_createxact))
/* routines in utils/cache/relcache.c */
extern void RelationIncrementReferenceCount(Relation rel);
extern void RelationDecrementReferenceCount(Relation rel);
#endif /* REL_H */
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