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blue-lemon0104
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pg_include/access/genam.h
Executable file
193
pg_include/access/genam.h
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/*-------------------------------------------------------------------------
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*
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* genam.h
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* POSTGRES generalized index access method definitions.
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*
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*
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* Portions Copyright (c) 1996-2012, 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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* src/include/access/genam.h
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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/sdir.h"
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#include "access/skey.h"
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#include "nodes/tidbitmap.h"
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#include "storage/lock.h"
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#include "utils/relcache.h"
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#include "utils/snapshot.h"
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/*
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* Struct for statistics returned by ambuild
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*/
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typedef struct IndexBuildResult
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{
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double heap_tuples; /* # of tuples seen in parent table */
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double index_tuples; /* # of tuples inserted into index */
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} IndexBuildResult;
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/*
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* Struct for input arguments passed to ambulkdelete and amvacuumcleanup
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*
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* num_heap_tuples is accurate only when estimated_count is false;
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* otherwise it's just an estimate (currently, the estimate is the
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* prior value of the relation's pg_class.reltuples field). It will
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* always just be an estimate during ambulkdelete.
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*/
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typedef struct IndexVacuumInfo
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{
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Relation index; /* the index being vacuumed */
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bool analyze_only; /* ANALYZE (without any actual vacuum) */
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bool estimated_count; /* num_heap_tuples is an estimate */
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int message_level; /* ereport level for progress messages */
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double num_heap_tuples; /* tuples remaining in heap */
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BufferAccessStrategy strategy; /* access strategy for reads */
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} IndexVacuumInfo;
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/*
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* Struct for statistics returned by ambulkdelete and amvacuumcleanup
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*
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* This struct is normally allocated by the first ambulkdelete call and then
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* passed along through subsequent ones until amvacuumcleanup; however,
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* amvacuumcleanup must be prepared to allocate it in the case where no
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* ambulkdelete calls were made (because no tuples needed deletion).
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* Note that an index AM could choose to return a larger struct
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* of which this is just the first field; this provides a way for ambulkdelete
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* to communicate additional private data to amvacuumcleanup.
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*
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* Note: pages_removed is the amount by which the index physically shrank,
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* if any (ie the change in its total size on disk). pages_deleted and
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* pages_free refer to free space within the index file. Some index AMs
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* may compute num_index_tuples by reference to num_heap_tuples, in which
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* case they should copy the estimated_count field from IndexVacuumInfo.
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*/
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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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BlockNumber pages_removed; /* # removed during vacuum operation */
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bool estimated_count; /* num_index_tuples is an estimate */
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double num_index_tuples; /* tuples remaining */
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double tuples_removed; /* # removed during vacuum operation */
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BlockNumber pages_deleted; /* # unused pages in index */
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BlockNumber pages_free; /* # pages available for reuse */
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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 definitions appear in relscan.h */
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typedef struct IndexScanDescData *IndexScanDesc;
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typedef struct SysScanDescData *SysScanDesc;
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/*
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* Enumeration specifying the type of uniqueness check to perform in
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* index_insert().
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*
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* UNIQUE_CHECK_YES is the traditional Postgres immediate check, possibly
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* blocking to see if a conflicting transaction commits.
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*
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* For deferrable unique constraints, UNIQUE_CHECK_PARTIAL is specified at
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* insertion time. The index AM should test if the tuple is unique, but
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* should not throw error, block, or prevent the insertion if the tuple
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* appears not to be unique. We'll recheck later when it is time for the
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* constraint to be enforced. The AM must return true if the tuple is
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* known unique, false if it is possibly non-unique. In the "true" case
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* it is safe to omit the later recheck.
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*
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* When it is time to recheck the deferred constraint, a pseudo-insertion
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* call is made with UNIQUE_CHECK_EXISTING. The tuple is already in the
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* index in this case, so it should not be inserted again. Rather, just
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* check for conflicting live tuples (possibly blocking).
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*/
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typedef enum IndexUniqueCheck
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{
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UNIQUE_CHECK_NO, /* Don't do any uniqueness checking */
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UNIQUE_CHECK_YES, /* Enforce uniqueness at insertion time */
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UNIQUE_CHECK_PARTIAL, /* Test uniqueness, but no error */
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UNIQUE_CHECK_EXISTING /* Check if existing tuple is unique */
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} IndexUniqueCheck;
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/*
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* generalized index_ interface routines (in indexam.c)
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*/
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/*
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* IndexScanIsValid
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* True iff the index scan is valid.
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*/
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#define IndexScanIsValid(scan) PointerIsValid(scan)
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extern Relation index_open(Oid relationId, LOCKMODE lockmode);
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extern void index_close(Relation relation, LOCKMODE lockmode);
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extern bool index_insert(Relation indexRelation,
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Datum *values, bool *isnull,
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ItemPointer heap_t_ctid,
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Relation heapRelation,
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IndexUniqueCheck checkUnique);
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extern IndexScanDesc index_beginscan(Relation heapRelation,
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Relation indexRelation,
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Snapshot snapshot,
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int nkeys, int norderbys);
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extern IndexScanDesc index_beginscan_bitmap(Relation indexRelation,
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Snapshot snapshot,
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int nkeys);
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extern void index_rescan(IndexScanDesc scan,
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ScanKey keys, int nkeys,
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ScanKey orderbys, int norderbys);
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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 ItemPointer index_getnext_tid(IndexScanDesc scan,
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ScanDirection direction);
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extern HeapTuple index_fetch_heap(IndexScanDesc scan);
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extern HeapTuple index_getnext(IndexScanDesc scan, ScanDirection direction);
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extern int64 index_getbitmap(IndexScanDesc scan, TIDBitmap *bitmap);
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extern IndexBulkDeleteResult *index_bulk_delete(IndexVacuumInfo *info,
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IndexBulkDeleteResult *stats,
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IndexBulkDeleteCallback callback,
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void *callback_state);
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extern IndexBulkDeleteResult *index_vacuum_cleanup(IndexVacuumInfo *info,
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IndexBulkDeleteResult *stats);
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extern bool index_can_return(Relation indexRelation);
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extern RegProcedure index_getprocid(Relation irel, AttrNumber attnum,
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uint16 procnum);
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extern 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 indexRelation,
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int nkeys, int norderbys);
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extern void IndexScanEnd(IndexScanDesc scan);
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extern char *BuildIndexValueDescription(Relation indexRelation,
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Datum *values, bool *isnull);
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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 heapRelation,
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Oid indexId,
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bool indexOK,
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Snapshot snapshot,
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int nkeys, ScanKey key);
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extern HeapTuple systable_getnext(SysScanDesc sysscan);
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extern bool systable_recheck_tuple(SysScanDesc sysscan, HeapTuple tup);
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extern void systable_endscan(SysScanDesc sysscan);
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extern SysScanDesc systable_beginscan_ordered(Relation heapRelation,
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Relation indexRelation,
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Snapshot snapshot,
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int nkeys, ScanKey key);
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extern HeapTuple systable_getnext_ordered(SysScanDesc sysscan,
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ScanDirection direction);
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extern void systable_endscan_ordered(SysScanDesc sysscan);
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#endif /* GENAM_H */
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