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32e8fc4a28
routines in the index's relcache entry, instead of doing a fresh fmgr_info on every index access. We were already doing this for the index's opclass support functions; not sure why we didn't think to do it for the AM functions too. This supersedes the former method of caching (only) amgettuple in indexscan scan descriptors; it's an improvement because the function lookup can be amortized across multiple statements instead of being repeated for each statement. Even though lookup for builtin functions is pretty cheap, this seems to drop a percent or two off some simple benchmarks.
300 lines
8.4 KiB
C
300 lines
8.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* rel.h
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* POSTGRES relation descriptor (a/k/a relcache entry) definitions.
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.84 2005/05/27 23:31:21 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef REL_H
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#define REL_H
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#include "access/tupdesc.h"
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#include "catalog/pg_am.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_index.h"
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#include "fmgr.h"
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#include "rewrite/prs2lock.h"
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#include "storage/block.h"
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#include "storage/relfilenode.h"
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/*
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* LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
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* to declare them here so we can have a LockInfoData field in a Relation.
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*/
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typedef struct LockRelId
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{
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Oid relId; /* a relation identifier */
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Oid dbId; /* a database identifier */
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} LockRelId;
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typedef struct LockInfoData
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{
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LockRelId lockRelId;
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} LockInfoData;
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typedef LockInfoData *LockInfo;
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/*
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* Likewise, this struct really belongs to trigger.h, but for convenience
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* we put it here.
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*/
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typedef struct Trigger
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{
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Oid tgoid; /* OID of trigger (pg_trigger row) */
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/* Remaining fields are copied from pg_trigger, see pg_trigger.h */
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char *tgname;
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Oid tgfoid;
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int16 tgtype;
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bool tgenabled;
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bool tgisconstraint;
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Oid tgconstrrelid;
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bool tgdeferrable;
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bool tginitdeferred;
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int16 tgnargs;
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int16 tgnattr;
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int16 *tgattr;
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char **tgargs;
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} Trigger;
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typedef struct TriggerDesc
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{
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/*
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* Index data to identify which triggers are which. Since each
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* trigger can appear in more than one class, for each class we
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* provide a list of integer indexes into the triggers array.
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*/
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#define TRIGGER_NUM_EVENT_CLASSES 3
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uint16 n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_before_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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/* The actual array of triggers is here */
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Trigger *triggers;
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int numtriggers;
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} TriggerDesc;
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/*
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* Same for the statistics collector data in Relation and scan data.
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*/
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typedef struct PgStat_Info
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{
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void *tabentry;
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bool no_stats;
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bool heap_scan_counted;
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bool index_scan_counted;
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} PgStat_Info;
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/*
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* Cached lookup information for the index access method functions defined
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* by the pg_am row associated with an index relation.
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*/
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typedef struct RelationAmInfo
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{
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FmgrInfo aminsert;
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FmgrInfo ambeginscan;
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FmgrInfo amgettuple;
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FmgrInfo amgetmulti;
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FmgrInfo amrescan;
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FmgrInfo amendscan;
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FmgrInfo ammarkpos;
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FmgrInfo amrestrpos;
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FmgrInfo ambuild;
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FmgrInfo ambulkdelete;
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FmgrInfo amvacuumcleanup;
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FmgrInfo amcostestimate;
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} RelationAmInfo;
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/*
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* Here are the contents of a relation cache entry.
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*/
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typedef struct RelationData
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{
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RelFileNode rd_node; /* relation physical identifier */
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/* use "struct" here to avoid needing to include smgr.h: */
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struct SMgrRelationData *rd_smgr; /* cached file handle, or NULL */
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BlockNumber rd_targblock; /* current insertion target block, or
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* InvalidBlockNumber */
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int rd_refcnt; /* reference count */
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bool rd_istemp; /* rel uses the local buffer mgr */
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bool rd_isnailed; /* rel is nailed in cache */
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bool rd_isvalid; /* relcache entry is valid */
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char rd_indexvalid; /* state of rd_indexlist: 0 = not valid, 1
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* = valid, 2 = temporarily forced */
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SubTransactionId rd_createSubid; /* rel was created in current xact */
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/*
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* rd_createSubid is the ID of the highest subtransaction the rel has
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* survived into; or zero if the rel was not created in the current
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* top transaction. This should be relied on only for optimization
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* purposes; it is possible for new-ness to be "forgotten" (eg, after
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* CLUSTER).
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*/
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Form_pg_class rd_rel; /* RELATION tuple */
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TupleDesc rd_att; /* tuple descriptor */
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Oid rd_id; /* relation's object id */
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List *rd_indexlist; /* list of OIDs of indexes on relation */
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LockInfoData rd_lockInfo; /* lock mgr's info for locking relation */
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RuleLock *rd_rules; /* rewrite rules */
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MemoryContext rd_rulescxt; /* private memory cxt for rd_rules, if any */
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TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */
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/* These are non-NULL only for an index relation: */
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Form_pg_index rd_index; /* pg_index tuple describing this index */
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struct HeapTupleData *rd_indextuple; /* all of pg_index tuple */
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/* "struct HeapTupleData *" avoids need to include htup.h here */
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oidvector *rd_indclass; /* extracted pointer to rd_index field */
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Form_pg_am rd_am; /* pg_am tuple for index's AM */
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/*
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* index access support info (used only for an index relation)
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*
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* Note: only default operators and support procs for each opclass are
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* cached, namely those with subtype zero. The arrays are indexed by
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* strategy or support number, which is a sufficient identifier given
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* that restriction.
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*/
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MemoryContext rd_indexcxt; /* private memory cxt for this stuff */
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RelationAmInfo *rd_aminfo; /* lookup info for funcs found in pg_am */
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Oid *rd_operator; /* OIDs of index operators */
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RegProcedure *rd_support; /* OIDs of support procedures */
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FmgrInfo *rd_supportinfo; /* lookup info for support procedures */
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List *rd_indexprs; /* index expression trees, if any */
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List *rd_indpred; /* index predicate tree, if any */
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/* statistics collection area */
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PgStat_Info pgstat_info;
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} RelationData;
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typedef RelationData *Relation;
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/* ----------------
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* RelationPtr is used in the executor to support index scans
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* where we have to keep track of several index relations in an
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* array. -cim 9/10/89
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* ----------------
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*/
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typedef Relation *RelationPtr;
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/*
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* RelationIsValid
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* True iff relation descriptor is valid.
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*/
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#define RelationIsValid(relation) PointerIsValid(relation)
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#define InvalidRelation ((Relation) NULL)
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/*
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* RelationHasReferenceCountZero
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* True iff relation reference count is zero.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationHasReferenceCountZero(relation) \
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((bool)((relation)->rd_refcnt == 0))
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/*
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* RelationGetForm
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* Returns pg_class tuple for a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetForm(relation) ((relation)->rd_rel)
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/*
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* RelationGetRelid
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* Returns the OID of the relation
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*/
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#define RelationGetRelid(relation) ((relation)->rd_id)
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/*
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* RelationGetNumberOfAttributes
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* Returns the number of attributes in a relation.
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*/
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#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
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/*
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* RelationGetDescr
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* Returns tuple descriptor for a relation.
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*/
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#define RelationGetDescr(relation) ((relation)->rd_att)
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/*
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* RelationGetRelationName
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* Returns the rel's name.
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*
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* Note that the name is only unique within the containing namespace.
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*/
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#define RelationGetRelationName(relation) \
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(NameStr((relation)->rd_rel->relname))
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/*
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* RelationGetNamespace
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* Returns the rel's namespace OID.
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*/
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#define RelationGetNamespace(relation) \
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((relation)->rd_rel->relnamespace)
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/*
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* RelationOpenSmgr
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* Open the relation at the smgr level, if not already done.
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*/
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#define RelationOpenSmgr(relation) \
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do { \
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if ((relation)->rd_smgr == NULL) \
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smgrsetowner(&((relation)->rd_smgr), smgropen((relation)->rd_node)); \
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} while (0)
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/*
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* RelationCloseSmgr
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* Close the relation at the smgr level, if not already done.
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*
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* Note: smgrclose should unhook from owner pointer, hence the Assert.
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*/
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#define RelationCloseSmgr(relation) \
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do { \
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if ((relation)->rd_smgr != NULL) \
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{ \
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smgrclose((relation)->rd_smgr); \
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Assert((relation)->rd_smgr == NULL); \
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} \
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} while (0)
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/*
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* RELATION_IS_LOCAL
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* If a rel is either temp or newly created in the current transaction,
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* it can be assumed to be visible only to the current backend.
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*
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* Beware of multiple eval of argument
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*/
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#define RELATION_IS_LOCAL(relation) \
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((relation)->rd_istemp || \
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(relation)->rd_createSubid != InvalidSubTransactionId)
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/* routines in utils/cache/relcache.c */
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extern void RelationIncrementReferenceCount(Relation rel);
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extern void RelationDecrementReferenceCount(Relation rel);
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#endif /* REL_H */
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