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96 lines
3.3 KiB
96 lines
3.3 KiB
/*-------------------------------------------------------------------------
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*
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* genam.h
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* POSTGRES general access method definitions.
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*
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*
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* Portions Copyright (c) 1996-2001, 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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* $Id: genam.h,v 1.33 2002/03/26 19:16:17 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef GENAM_H
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#define GENAM_H
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#include "access/itup.h"
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#include "access/relscan.h"
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#include "access/sdir.h"
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#include "nodes/primnodes.h"
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/* Struct for statistics returned by bulk-delete operation */
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typedef struct IndexBulkDeleteResult
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{
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BlockNumber num_pages; /* pages remaining in index */
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double tuples_removed; /* # removed by bulk-delete operation */
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double num_index_tuples; /* # remaining */
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} IndexBulkDeleteResult;
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/* Typedef for callback function to determine if a tuple is bulk-deletable */
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typedef bool (*IndexBulkDeleteCallback) (ItemPointer itemptr, void *state);
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/* Struct for heap-or-index scans of system tables */
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typedef struct SysScanDescData
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{
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Relation heap_rel; /* catalog being scanned */
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Snapshot snapshot; /* time qual (normally SnapshotNow) */
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Relation irel; /* NULL if doing heap scan */
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HeapScanDesc scan; /* only valid in heap-scan case */
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IndexScanDesc iscan; /* only valid in index-scan case */
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HeapTupleData tuple; /* workspace for indexscan */
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Buffer buffer; /* working state for indexscan */
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} SysScanDescData;
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typedef SysScanDescData *SysScanDesc;
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/*
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* generalized index_ interface routines (in indexam.c)
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*/
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extern Relation index_open(Oid relationId);
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extern Relation index_openrv(const RangeVar *relation);
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extern Relation index_openr(const char *sysRelationName);
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extern void index_close(Relation relation);
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extern InsertIndexResult index_insert(Relation relation,
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Datum *datum, char *nulls,
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ItemPointer heap_t_ctid,
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Relation heapRel);
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extern IndexScanDesc index_beginscan(Relation relation, bool scanFromEnd,
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uint16 numberOfKeys, ScanKey key);
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extern void index_rescan(IndexScanDesc scan, bool scanFromEnd, ScanKey key);
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extern void index_endscan(IndexScanDesc scan);
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extern void index_markpos(IndexScanDesc scan);
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extern void index_restrpos(IndexScanDesc scan);
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extern RetrieveIndexResult index_getnext(IndexScanDesc scan,
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ScanDirection direction);
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extern IndexBulkDeleteResult *index_bulk_delete(Relation relation,
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IndexBulkDeleteCallback callback,
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void *callback_state);
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extern RegProcedure index_cost_estimator(Relation relation);
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extern RegProcedure index_getprocid(Relation irel, AttrNumber attnum,
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uint16 procnum);
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extern struct FmgrInfo *index_getprocinfo(Relation irel, AttrNumber attnum,
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uint16 procnum);
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/*
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* index access method support routines (in genam.c)
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*/
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extern IndexScanDesc RelationGetIndexScan(Relation relation, bool scanFromEnd,
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uint16 numberOfKeys, ScanKey key);
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extern void IndexScanEnd(IndexScanDesc scan);
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/*
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* heap-or-index access to system catalogs (in genam.c)
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*/
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extern SysScanDesc systable_beginscan(Relation rel,
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const char *indexRelname,
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bool indexOK,
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Snapshot snapshot,
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unsigned nkeys, ScanKey key);
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extern HeapTuple systable_getnext(SysScanDesc sysscan);
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extern void systable_endscan(SysScanDesc sysscan);
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#endif /* GENAM_H */
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