genam.h File Reference

#include "access/sdir.h"
#include "access/skey.h"
#include "nodes/tidbitmap.h"
#include "storage/lockdefs.h"
#include "utils/relcache.h"
#include "utils/snapshot.h"

Include dependency graph for genam.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	IndexBuildResult
struct	IndexVacuumInfo
struct	IndexBulkDeleteResult
struct	IndexOrderByDistance

Macros
#define	IndexScanIsValid(scan)   PointerIsValid(scan)

Typedefs
typedef struct IndexBuildResult	IndexBuildResult
typedef struct IndexVacuumInfo	IndexVacuumInfo
typedef struct IndexBulkDeleteResult	IndexBulkDeleteResult
typedef bool(*	IndexBulkDeleteCallback) (ItemPointer itemptr, void *state)
typedef struct IndexScanDescData *	IndexScanDesc
typedef struct SysScanDescData *	SysScanDesc
typedef struct ParallelIndexScanDescData *	ParallelIndexScanDesc
typedef enum IndexUniqueCheck	IndexUniqueCheck
typedef struct IndexOrderByDistance	IndexOrderByDistance

Enumerations
enum	IndexUniqueCheck { UNIQUE_CHECK_NO , UNIQUE_CHECK_YES , UNIQUE_CHECK_PARTIAL , UNIQUE_CHECK_EXISTING }

Functions
Relation	index_open (Oid relationId, LOCKMODE lockmode)
void	index_close (Relation relation, LOCKMODE lockmode)
bool	index_insert (Relation indexRelation, Datum *values, bool *isnull, ItemPointer heap_t_ctid, Relation heapRelation, IndexUniqueCheck checkUnique, bool indexUnchanged, struct IndexInfo *indexInfo)
IndexScanDesc	index_beginscan (Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, int norderbys)
IndexScanDesc	index_beginscan_bitmap (Relation indexRelation, Snapshot snapshot, int nkeys)
void	index_rescan (IndexScanDesc scan, ScanKey keys, int nkeys, ScanKey orderbys, int norderbys)
void	index_endscan (IndexScanDesc scan)
void	index_markpos (IndexScanDesc scan)
void	index_restrpos (IndexScanDesc scan)
Size	index_parallelscan_estimate (Relation indexRelation, Snapshot snapshot)
void	index_parallelscan_initialize (Relation heapRelation, Relation indexRelation, Snapshot snapshot, ParallelIndexScanDesc target)
void	index_parallelrescan (IndexScanDesc scan)
IndexScanDesc	index_beginscan_parallel (Relation heaprel, Relation indexrel, int nkeys, int norderbys, ParallelIndexScanDesc pscan)
ItemPointer	index_getnext_tid (IndexScanDesc scan, ScanDirection direction)
bool	index_fetch_heap (IndexScanDesc scan, struct TupleTableSlot *slot)
bool	index_getnext_slot (IndexScanDesc scan, ScanDirection direction, struct TupleTableSlot *slot)
int64	index_getbitmap (IndexScanDesc scan, TIDBitmap *bitmap)
IndexBulkDeleteResult *	index_bulk_delete (IndexVacuumInfo *info, IndexBulkDeleteResult *istat, IndexBulkDeleteCallback callback, void *callback_state)
IndexBulkDeleteResult *	index_vacuum_cleanup (IndexVacuumInfo *info, IndexBulkDeleteResult *istat)
bool	index_can_return (Relation indexRelation, int attno)
RegProcedure	index_getprocid (Relation irel, AttrNumber attnum, uint16 procnum)
FmgrInfo *	index_getprocinfo (Relation irel, AttrNumber attnum, uint16 procnum)
void	index_store_float8_orderby_distances (IndexScanDesc scan, Oid *orderByTypes, IndexOrderByDistance *distances, bool recheckOrderBy)
bytea *	index_opclass_options (Relation indrel, AttrNumber attnum, Datum attoptions, bool validate)
IndexScanDesc	RelationGetIndexScan (Relation indexRelation, int nkeys, int norderbys)
void	IndexScanEnd (IndexScanDesc scan)
char *	BuildIndexValueDescription (Relation indexRelation, Datum *values, bool *isnull)
TransactionId	index_compute_xid_horizon_for_tuples (Relation irel, Relation hrel, Buffer ibuf, OffsetNumber *itemnos, int nitems)
SysScanDesc	systable_beginscan (Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
HeapTuple	systable_getnext (SysScanDesc sysscan)
bool	systable_recheck_tuple (SysScanDesc sysscan, HeapTuple tup)
void	systable_endscan (SysScanDesc sysscan)
SysScanDesc	systable_beginscan_ordered (Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, ScanKey key)
HeapTuple	systable_getnext_ordered (SysScanDesc sysscan, ScanDirection direction)
void	systable_endscan_ordered (SysScanDesc sysscan)

Macro Definition Documentation

IndexScanIsValid

#define IndexScanIsValid

(

scan

)

PointerIsValid(scan)

Definition at line 139 of file genam.h.

Typedef Documentation

IndexBuildResult

typedef struct IndexBuildResult IndexBuildResult

IndexBulkDeleteCallback

typedef bool(* IndexBulkDeleteCallback) (ItemPointer itemptr, void *state)

Definition at line 87 of file genam.h.

IndexBulkDeleteResult

typedef struct IndexBulkDeleteResult IndexBulkDeleteResult

IndexOrderByDistance

typedef struct IndexOrderByDistance IndexOrderByDistance

IndexScanDesc

typedef struct IndexScanDescData* IndexScanDesc

Definition at line 90 of file genam.h.

IndexUniqueCheck

typedef enum IndexUniqueCheck IndexUniqueCheck

IndexVacuumInfo

typedef struct IndexVacuumInfo IndexVacuumInfo

ParallelIndexScanDesc

typedef struct ParallelIndexScanDescData* ParallelIndexScanDesc

Definition at line 93 of file genam.h.

SysScanDesc

typedef struct SysScanDescData* SysScanDesc

Definition at line 91 of file genam.h.

Enumeration Type Documentation

IndexUniqueCheck

enum IndexUniqueCheck

Enumerator
UNIQUE_CHECK_NO
UNIQUE_CHECK_YES
UNIQUE_CHECK_PARTIAL
UNIQUE_CHECK_EXISTING

Definition at line 115 of file genam.h.

{
    UNIQUE_CHECK_NO,            /* Don't do any uniqueness checking */
    UNIQUE_CHECK_YES,           /* Enforce uniqueness at insertion time */
    UNIQUE_CHECK_PARTIAL,       /* Test uniqueness, but no error */
    UNIQUE_CHECK_EXISTING       /* Check if existing tuple is unique */
} IndexUniqueCheck;

Function Documentation

BuildIndexValueDescription()

char* BuildIndexValueDescription	(	Relation	indexRelation,
		Datum *	values,
		bool *	isnull
	)

Definition at line 177 of file genam.c.

{
    StringInfoData buf;
    Form_pg_index idxrec;
    int         indnkeyatts;
    int         i;
    int         keyno;
    Oid         indexrelid = RelationGetRelid(indexRelation);
    Oid         indrelid;
    AclResult   aclresult;
 
    indnkeyatts = IndexRelationGetNumberOfKeyAttributes(indexRelation);
 
    /*
     * Check permissions- if the user does not have access to view all of the
     * key columns then return NULL to avoid leaking data.
     *
     * First check if RLS is enabled for the relation.  If so, return NULL to
     * avoid leaking data.
     *
     * Next we need to check table-level SELECT access and then, if there is
     * no access there, check column-level permissions.
     */
    idxrec = indexRelation->rd_index;
    indrelid = idxrec->indrelid;
    Assert(indexrelid == idxrec->indexrelid);
 
    /* RLS check- if RLS is enabled then we don't return anything. */
    if (check_enable_rls(indrelid, InvalidOid, true) == RLS_ENABLED)
        return NULL;
 
    /* Table-level SELECT is enough, if the user has it */
    aclresult = pg_class_aclcheck(indrelid, GetUserId(), ACL_SELECT);
    if (aclresult != ACLCHECK_OK)
    {
        /*
         * No table-level access, so step through the columns in the index and
         * make sure the user has SELECT rights on all of them.
         */
        for (keyno = 0; keyno < indnkeyatts; keyno++)
        {
            AttrNumber  attnum = idxrec->indkey.values[keyno];
 
            /*
             * Note that if attnum == InvalidAttrNumber, then this is an index
             * based on an expression and we return no detail rather than try
             * to figure out what column(s) the expression includes and if the
             * user has SELECT rights on them.
             */
            if (attnum == InvalidAttrNumber ||
                pg_attribute_aclcheck(indrelid, attnum, GetUserId(),
                                      ACL_SELECT) != ACLCHECK_OK)
            {
                /* No access, so clean up and return */
                return NULL;
            }
        }
    }
 
    initStringInfo(&buf);
    appendStringInfo(&buf, "(%s)=(",
                     pg_get_indexdef_columns(indexrelid, true));
 
    for (i = 0; i < indnkeyatts; i++)
    {
        char       *val;
 
        if (isnull[i])
            val = "null";
        else
        {
            Oid         foutoid;
            bool        typisvarlena;
 
            /*
             * The provided data is not necessarily of the type stored in the
             * index; rather it is of the index opclass's input type. So look
             * at rd_opcintype not the index tupdesc.
             *
             * Note: this is a bit shaky for opclasses that have pseudotype
             * input types such as ANYARRAY or RECORD.  Currently, the
             * typoutput functions associated with the pseudotypes will work
             * okay, but we might have to try harder in future.
             */
            getTypeOutputInfo(indexRelation->rd_opcintype[i],
                              &foutoid, &typisvarlena);
            val = OidOutputFunctionCall(foutoid, values[i]);
        }
 
        if (i > 0)
            appendStringInfoString(&buf, ", ");
        appendStringInfoString(&buf, val);
    }
 
    appendStringInfoChar(&buf, ')');
 
    return buf.data;
}

References ACL_SELECT, ACLCHECK_OK, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert(), attnum, buf, check_enable_rls(), getTypeOutputInfo(), GetUserId(), i, IndexRelationGetNumberOfKeyAttributes, initStringInfo(), InvalidAttrNumber, InvalidOid, OidOutputFunctionCall(), pg_attribute_aclcheck(), pg_class_aclcheck(), pg_get_indexdef_columns(), RelationData::rd_index, RelationData::rd_opcintype, RelationGetRelid, RLS_ENABLED, val, and values.

Referenced by _bt_check_unique(), check_exclusion_or_unique_constraint(), and comparetup_index_btree_tiebreak().

index_beginscan()

IndexScanDesc index_beginscan	(	Relation	heapRelation,
		Relation	indexRelation,
		Snapshot	snapshot,
		int	nkeys,
		int	norderbys
	)

Definition at line 205 of file indexam.c.

{
    IndexScanDesc scan;
 
    Assert(snapshot != InvalidSnapshot);
 
    scan = index_beginscan_internal(indexRelation, nkeys, norderbys, snapshot, NULL, false);
 
    /*
     * Save additional parameters into the scandesc.  Everything else was set
     * up by RelationGetIndexScan.
     */
    scan->heapRelation = heapRelation;
    scan->xs_snapshot = snapshot;
 
    /* prepare to fetch index matches from table */
    scan->xs_heapfetch = table_index_fetch_begin(heapRelation);
 
    return scan;
}

References Assert(), IndexScanDescData::heapRelation, index_beginscan_internal(), InvalidSnapshot, table_index_fetch_begin(), IndexScanDescData::xs_heapfetch, and IndexScanDescData::xs_snapshot.

Referenced by check_exclusion_or_unique_constraint(), get_actual_variable_endpoint(), heapam_relation_copy_for_cluster(), IndexNext(), IndexNextWithReorder(), IndexOnlyNext(), RelationFindReplTupleByIndex(), systable_beginscan(), and systable_beginscan_ordered().

index_beginscan_bitmap()

IndexScanDesc index_beginscan_bitmap	(	Relation	indexRelation,
		Snapshot	snapshot,
		int	nkeys
	)

Definition at line 236 of file indexam.c.

{
    IndexScanDesc scan;
 
    Assert(snapshot != InvalidSnapshot);
 
    scan = index_beginscan_internal(indexRelation, nkeys, 0, snapshot, NULL, false);
 
    /*
     * Save additional parameters into the scandesc.  Everything else was set
     * up by RelationGetIndexScan.
     */
    scan->xs_snapshot = snapshot;
 
    return scan;
}

References Assert(), index_beginscan_internal(), InvalidSnapshot, and IndexScanDescData::xs_snapshot.

Referenced by ExecInitBitmapIndexScan().

index_beginscan_parallel()

IndexScanDesc index_beginscan_parallel	(	Relation	heaprel,
		Relation	indexrel,
		int	nkeys,
		int	norderbys,
		ParallelIndexScanDesc	pscan
	)

Definition at line 492 of file indexam.c.

{
    Snapshot    snapshot;
    IndexScanDesc scan;
 
    Assert(RelationGetRelid(heaprel) == pscan->ps_relid);
    snapshot = RestoreSnapshot(pscan->ps_snapshot_data);
    RegisterSnapshot(snapshot);
    scan = index_beginscan_internal(indexrel, nkeys, norderbys, snapshot,
                                    pscan, true);
 
    /*
     * Save additional parameters into the scandesc.  Everything else was set
     * up by index_beginscan_internal.
     */
    scan->heapRelation = heaprel;
    scan->xs_snapshot = snapshot;
 
    /* prepare to fetch index matches from table */
    scan->xs_heapfetch = table_index_fetch_begin(heaprel);
 
    return scan;
}

References Assert(), IndexScanDescData::heapRelation, index_beginscan_internal(), ParallelIndexScanDescData::ps_relid, ParallelIndexScanDescData::ps_snapshot_data, RegisterSnapshot(), RelationGetRelid, RestoreSnapshot(), table_index_fetch_begin(), IndexScanDescData::xs_heapfetch, and IndexScanDescData::xs_snapshot.

Referenced by ExecIndexOnlyScanInitializeDSM(), ExecIndexOnlyScanInitializeWorker(), ExecIndexScanInitializeDSM(), and ExecIndexScanInitializeWorker().

index_bulk_delete()

IndexBulkDeleteResult* index_bulk_delete	(	IndexVacuumInfo *	info,
		IndexBulkDeleteResult *	istat,
		IndexBulkDeleteCallback	callback,
		void *	callback_state
	)

Definition at line 699 of file indexam.c.

{
    Relation    indexRelation = info->index;
 
    RELATION_CHECKS;
    CHECK_REL_PROCEDURE(ambulkdelete);
 
    return indexRelation->rd_indam->ambulkdelete(info, istat,
                                                 callback, callback_state);
}

References IndexAmRoutine::ambulkdelete, callback(), CHECK_REL_PROCEDURE, IndexVacuumInfo::index, RelationData::rd_indam, and RELATION_CHECKS.

Referenced by vac_bulkdel_one_index(), and validate_index().

index_can_return()

bool index_can_return	(	Relation	indexRelation,
		int	attno
	)

Definition at line 739 of file indexam.c.

{
    RELATION_CHECKS;
 
    /* amcanreturn is optional; assume false if not provided by AM */
    if (indexRelation->rd_indam->amcanreturn == NULL)
        return false;
 
    return indexRelation->rd_indam->amcanreturn(indexRelation, attno);
}

References IndexAmRoutine::amcanreturn, RelationData::rd_indam, and RELATION_CHECKS.

Referenced by get_relation_info(), and indexam_property().

index_close()

void index_close	(	Relation	relation,
		LOCKMODE	lockmode
	)

Definition at line 158 of file indexam.c.

{
    LockRelId   relid = relation->rd_lockInfo.lockRelId;
 
    Assert(lockmode >= NoLock && lockmode < MAX_LOCKMODES);
 
    /* The relcache does the real work... */
    RelationClose(relation);
 
    if (lockmode != NoLock)
        UnlockRelationId(&relid, lockmode);
}

References Assert(), LockInfoData::lockRelId, MAX_LOCKMODES, NoLock, RelationData::rd_lockInfo, RelationClose(), and UnlockRelationId().

Referenced by _bt_parallel_build_main(), ATExecAddIndex(), ATExecAddIndexConstraint(), ATExecReplicaIdentity(), AttachPartitionEnsureIndexes(), brin_page_items(), brincostestimate(), bt_index_check_internal(), build_indices(), BuildEventTriggerCache(), check_index_is_clusterable(), CheckIndexCompatible(), close_lo_relation(), copy_table_data(), DefineIndex(), DefineRelation(), DetachPartitionFinalize(), enum_endpoint(), enum_range_internal(), ExecCloseIndices(), ExecEndBitmapIndexScan(), ExecEndIndexOnlyScan(), ExecEndIndexScan(), ExecRefreshMatView(), expandTableLikeClause(), FindReplTupleInLocalRel(), FindUsableIndexForReplicaIdentityFull(), get_actual_variable_range(), get_relation_info(), gin_clean_pending_list(), gincostestimate(), gist_page_items(), hash_bitmap_info(), index_concurrently_build(), index_concurrently_create_copy(), index_concurrently_set_dead(), index_create(), index_drop(), indexam_property(), infer_arbiter_indexes(), InitCatCachePhase2(), lookup_ts_config_cache(), pg_nextoid(), pgstathashindex(), plan_create_index_workers(), refresh_by_match_merge(), reindex_index(), ReindexRelationConcurrently(), RelationFindReplTupleByIndex(), RelationGetIndexAttrBitmap(), RelationTruncateIndexes(), SetIndexStorageProperties(), systable_endscan(), toast_close_indexes(), TryReuseIndex(), vac_close_indexes(), vac_open_indexes(), and validate_index().

index_compute_xid_horizon_for_tuples()

TransactionId index_compute_xid_horizon_for_tuples	(	Relation	irel,
		Relation	hrel,
		Buffer	ibuf,
		OffsetNumber *	itemnos,
		int	nitems
	)

Definition at line 294 of file genam.c.

{
    TM_IndexDeleteOp delstate;
    TransactionId snapshotConflictHorizon = InvalidTransactionId;
    Page        ipage = BufferGetPage(ibuf);
    IndexTuple  itup;
 
    Assert(nitems > 0);
 
    delstate.irel = irel;
    delstate.iblknum = BufferGetBlockNumber(ibuf);
    delstate.bottomup = false;
    delstate.bottomupfreespace = 0;
    delstate.ndeltids = 0;
    delstate.deltids = palloc(nitems * sizeof(TM_IndexDelete));
    delstate.status = palloc(nitems * sizeof(TM_IndexStatus));
 
    /* identify what the index tuples about to be deleted point to */
    for (int i = 0; i < nitems; i++)
    {
        OffsetNumber offnum = itemnos[i];
        ItemId      iitemid;
 
        iitemid = PageGetItemId(ipage, offnum);
        itup = (IndexTuple) PageGetItem(ipage, iitemid);
 
        Assert(ItemIdIsDead(iitemid));
 
        ItemPointerCopy(&itup->t_tid, &delstate.deltids[i].tid);
        delstate.deltids[i].id = delstate.ndeltids;
        delstate.status[i].idxoffnum = offnum;
        delstate.status[i].knowndeletable = true;   /* LP_DEAD-marked */
        delstate.status[i].promising = false;   /* unused */
        delstate.status[i].freespace = 0;   /* unused */
 
        delstate.ndeltids++;
    }
 
    /* determine the actual xid horizon */
    snapshotConflictHorizon = table_index_delete_tuples(hrel, &delstate);
 
    /* assert tableam agrees that all items are deletable */
    Assert(delstate.ndeltids == nitems);
 
    pfree(delstate.deltids);
    pfree(delstate.status);
 
    return snapshotConflictHorizon;
}

References Assert(), TM_IndexDeleteOp::bottomup, TM_IndexDeleteOp::bottomupfreespace, BufferGetBlockNumber(), BufferGetPage(), TM_IndexDeleteOp::deltids, TM_IndexStatus::freespace, i, TM_IndexDeleteOp::iblknum, TM_IndexDelete::id, TM_IndexStatus::idxoffnum, InvalidTransactionId, TM_IndexDeleteOp::irel, ItemIdIsDead, ItemPointerCopy(), TM_IndexStatus::knowndeletable, TM_IndexDeleteOp::ndeltids, nitems, PageGetItem(), PageGetItemId(), palloc(), pfree(), TM_IndexStatus::promising, TM_IndexDeleteOp::status, IndexTupleData::t_tid, table_index_delete_tuples(), and TM_IndexDelete::tid.

Referenced by _hash_vacuum_one_page(), and gistprunepage().

index_endscan()

void index_endscan

(

IndexScanDesc

scan

)

Definition at line 327 of file indexam.c.

{
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(amendscan);
 
    /* Release resources (like buffer pins) from table accesses */
    if (scan->xs_heapfetch)
    {
        table_index_fetch_end(scan->xs_heapfetch);
        scan->xs_heapfetch = NULL;
    }
 
    /* End the AM's scan */
    scan->indexRelation->rd_indam->amendscan(scan);
 
    /* Release index refcount acquired by index_beginscan */
    RelationDecrementReferenceCount(scan->indexRelation);
 
    if (scan->xs_temp_snap)
        UnregisterSnapshot(scan->xs_snapshot);
 
    /* Release the scan data structure itself */
    IndexScanEnd(scan);
}

References IndexAmRoutine::amendscan, CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, IndexScanEnd(), RelationData::rd_indam, RelationDecrementReferenceCount(), SCAN_CHECKS, table_index_fetch_end(), UnregisterSnapshot(), IndexScanDescData::xs_heapfetch, IndexScanDescData::xs_snapshot, and IndexScanDescData::xs_temp_snap.

Referenced by check_exclusion_or_unique_constraint(), ExecEndBitmapIndexScan(), ExecEndIndexOnlyScan(), ExecEndIndexScan(), get_actual_variable_endpoint(), heapam_relation_copy_for_cluster(), RelationFindReplTupleByIndex(), systable_endscan(), and systable_endscan_ordered().

index_fetch_heap()

bool index_fetch_heap	(	IndexScanDesc	scan,
		struct TupleTableSlot *	slot
	)

Definition at line 583 of file indexam.c.

{
    bool        all_dead = false;
    bool        found;
 
    found = table_index_fetch_tuple(scan->xs_heapfetch, &scan->xs_heaptid,
                                    scan->xs_snapshot, slot,
                                    &scan->xs_heap_continue, &all_dead);
 
    if (found)
        pgstat_count_heap_fetch(scan->indexRelation);
 
    /*
     * If we scanned a whole HOT chain and found only dead tuples, tell index
     * AM to kill its entry for that TID (this will take effect in the next
     * amgettuple call, in index_getnext_tid).  We do not do this when in
     * recovery because it may violate MVCC to do so.  See comments in
     * RelationGetIndexScan().
     */
    if (!scan->xactStartedInRecovery)
        scan->kill_prior_tuple = all_dead;
 
    return found;
}

References IndexScanDescData::indexRelation, IndexScanDescData::kill_prior_tuple, pgstat_count_heap_fetch, table_index_fetch_tuple(), IndexScanDescData::xactStartedInRecovery, IndexScanDescData::xs_heap_continue, IndexScanDescData::xs_heapfetch, IndexScanDescData::xs_heaptid, and IndexScanDescData::xs_snapshot.

Referenced by get_actual_variable_endpoint(), index_getnext_slot(), and IndexOnlyNext().

index_getbitmap()

int64 index_getbitmap	(	IndexScanDesc	scan,
		TIDBitmap *	bitmap
	)

Definition at line 669 of file indexam.c.

{
    int64       ntids;
 
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(amgetbitmap);
 
    /* just make sure this is false... */
    scan->kill_prior_tuple = false;
 
    /*
     * have the am's getbitmap proc do all the work.
     */
    ntids = scan->indexRelation->rd_indam->amgetbitmap(scan, bitmap);
 
    pgstat_count_index_tuples(scan->indexRelation, ntids);
 
    return ntids;
}

References IndexAmRoutine::amgetbitmap, CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, IndexScanDescData::kill_prior_tuple, pgstat_count_index_tuples, RelationData::rd_indam, and SCAN_CHECKS.

Referenced by MultiExecBitmapIndexScan().

index_getnext_slot()

bool index_getnext_slot	(	IndexScanDesc	scan,
		ScanDirection	direction,
		struct TupleTableSlot *	slot
	)

Definition at line 624 of file indexam.c.

{
    for (;;)
    {
        if (!scan->xs_heap_continue)
        {
            ItemPointer tid;
 
            /* Time to fetch the next TID from the index */
            tid = index_getnext_tid(scan, direction);
 
            /* If we're out of index entries, we're done */
            if (tid == NULL)
                break;
 
            Assert(ItemPointerEquals(tid, &scan->xs_heaptid));
        }
 
        /*
         * Fetch the next (or only) visible heap tuple for this index entry.
         * If we don't find anything, loop around and grab the next TID from
         * the index.
         */
        Assert(ItemPointerIsValid(&scan->xs_heaptid));
        if (index_fetch_heap(scan, slot))
            return true;
    }
 
    return false;
}

References Assert(), index_fetch_heap(), index_getnext_tid(), ItemPointerEquals(), ItemPointerIsValid(), IndexScanDescData::xs_heap_continue, and IndexScanDescData::xs_heaptid.

Referenced by check_exclusion_or_unique_constraint(), heapam_relation_copy_for_cluster(), IndexNext(), IndexNextWithReorder(), RelationFindReplTupleByIndex(), systable_getnext(), and systable_getnext_ordered().

index_getnext_tid()

ItemPointer index_getnext_tid	(	IndexScanDesc	scan,
		ScanDirection	direction
	)

Definition at line 525 of file indexam.c.

{
    bool        found;
 
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(amgettuple);
 
    /* XXX: we should assert that a snapshot is pushed or registered */
    Assert(TransactionIdIsValid(RecentXmin));
 
    /*
     * The AM's amgettuple proc finds the next index entry matching the scan
     * keys, and puts the TID into scan->xs_heaptid.  It should also set
     * scan->xs_recheck and possibly scan->xs_itup/scan->xs_hitup, though we
     * pay no attention to those fields here.
     */
    found = scan->indexRelation->rd_indam->amgettuple(scan, direction);
 
    /* Reset kill flag immediately for safety */
    scan->kill_prior_tuple = false;
    scan->xs_heap_continue = false;
 
    /* If we're out of index entries, we're done */
    if (!found)
    {
        /* release resources (like buffer pins) from table accesses */
        if (scan->xs_heapfetch)
            table_index_fetch_reset(scan->xs_heapfetch);
 
        return NULL;
    }
    Assert(ItemPointerIsValid(&scan->xs_heaptid));
 
    pgstat_count_index_tuples(scan->indexRelation, 1);
 
    /* Return the TID of the tuple we found. */
    return &scan->xs_heaptid;
}

References IndexAmRoutine::amgettuple, Assert(), CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, ItemPointerIsValid(), IndexScanDescData::kill_prior_tuple, pgstat_count_index_tuples, RelationData::rd_indam, RecentXmin, SCAN_CHECKS, table_index_fetch_reset(), TransactionIdIsValid, IndexScanDescData::xs_heap_continue, IndexScanDescData::xs_heapfetch, and IndexScanDescData::xs_heaptid.

Referenced by get_actual_variable_endpoint(), index_getnext_slot(), and IndexOnlyNext().

index_getprocid()

RegProcedure index_getprocid	(	Relation	irel,
		AttrNumber	attnum,
		uint16	procnum
	)

Definition at line 777 of file indexam.c.

{
    RegProcedure *loc;
    int         nproc;
    int         procindex;
 
    nproc = irel->rd_indam->amsupport;
 
    Assert(procnum > 0 && procnum <= (uint16) nproc);
 
    procindex = (nproc * (attnum - 1)) + (procnum - 1);
 
    loc = irel->rd_support;
 
    Assert(loc != NULL);
 
    return loc[procindex];
}

References IndexAmRoutine::amsupport, Assert(), attnum, RelationData::rd_indam, and RelationData::rd_support.

Referenced by _hash_init(), bloom_get_procinfo(), gistbuild(), gistcanreturn(), inclusion_get_procinfo(), index_opclass_options(), initGinState(), initGISTstate(), minmax_multi_get_procinfo(), RelationGetIndexRawAttOptions(), spgdoinsert(), and spgGetCache().

index_getprocinfo()

FmgrInfo* index_getprocinfo	(	Relation	irel,
		AttrNumber	attnum,
		uint16	procnum
	)

Definition at line 811 of file indexam.c.

{
    FmgrInfo   *locinfo;
    int         nproc;
    int         optsproc;
    int         procindex;
 
    nproc = irel->rd_indam->amsupport;
    optsproc = irel->rd_indam->amoptsprocnum;
 
    Assert(procnum > 0 && procnum <= (uint16) nproc);
 
    procindex = (nproc * (attnum - 1)) + (procnum - 1);
 
    locinfo = irel->rd_supportinfo;
 
    Assert(locinfo != NULL);
 
    locinfo += procindex;
 
    /* Initialize the lookup info if first time through */
    if (locinfo->fn_oid == InvalidOid)
    {
        RegProcedure *loc = irel->rd_support;
        RegProcedure procId;
 
        Assert(loc != NULL);
 
        procId = loc[procindex];
 
        /*
         * Complain if function was not found during IndexSupportInitialize.
         * This should not happen unless the system tables contain bogus
         * entries for the index opclass.  (If an AM wants to allow a support
         * function to be optional, it can use index_getprocid.)
         */
        if (!RegProcedureIsValid(procId))
            elog(ERROR, "missing support function %d for attribute %d of index \"%s\"",
                 procnum, attnum, RelationGetRelationName(irel));
 
        fmgr_info_cxt(procId, locinfo, irel->rd_indexcxt);
 
        if (procnum != optsproc)
        {
            /* Initialize locinfo->fn_expr with opclass options Const */
            bytea     **attoptions = RelationGetIndexAttOptions(irel, false);
            MemoryContext oldcxt = MemoryContextSwitchTo(irel->rd_indexcxt);
 
            set_fn_opclass_options(locinfo, attoptions[attnum - 1]);
 
            MemoryContextSwitchTo(oldcxt);
        }
    }
 
    return locinfo;
}

References IndexAmRoutine::amoptsprocnum, IndexAmRoutine::amsupport, Assert(), attnum, elog(), ERROR, fmgr_info_cxt(), FmgrInfo::fn_oid, InvalidOid, MemoryContextSwitchTo(), RelationData::rd_indam, RelationData::rd_indexcxt, RelationData::rd_support, RelationData::rd_supportinfo, RegProcedureIsValid, RelationGetIndexAttOptions(), RelationGetRelationName, and set_fn_opclass_options().

Referenced by _bt_first(), _bt_mkscankey(), _hash_datum2hashkey(), add_values_to_range(), bloom_get_procinfo(), brin_build_desc(), bringetbitmap(), doPickSplit(), inclusion_get_procinfo(), index_opclass_options(), initBloomState(), initGinState(), initGISTstate(), minmax_multi_get_procinfo(), spgbeginscan(), spgdoinsert(), spgGetCache(), and union_tuples().

index_insert()

bool index_insert	(	Relation	indexRelation,
		Datum *	values,
		bool *	isnull,
		ItemPointer	heap_t_ctid,
		Relation	heapRelation,
		IndexUniqueCheck	checkUnique,
		bool	indexUnchanged,
		struct IndexInfo *	indexInfo
	)

Definition at line 176 of file indexam.c.

{
    RELATION_CHECKS;
    CHECK_REL_PROCEDURE(aminsert);
 
    if (!(indexRelation->rd_indam->ampredlocks))
        CheckForSerializableConflictIn(indexRelation,
                                       (ItemPointer) NULL,
                                       InvalidBlockNumber);
 
    return indexRelation->rd_indam->aminsert(indexRelation, values, isnull,
                                             heap_t_ctid, heapRelation,
                                             checkUnique, indexUnchanged,
                                             indexInfo);
}

References IndexAmRoutine::aminsert, IndexAmRoutine::ampredlocks, CHECK_REL_PROCEDURE, CheckForSerializableConflictIn(), InvalidBlockNumber, RelationData::rd_indam, RELATION_CHECKS, and values.

Referenced by CatalogIndexInsert(), ExecInsertIndexTuples(), heapam_index_validate_scan(), and toast_save_datum().

index_markpos()

void index_markpos

(

IndexScanDesc

scan

)

Definition at line 357 of file indexam.c.

{
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(ammarkpos);
 
    scan->indexRelation->rd_indam->ammarkpos(scan);
}

References IndexAmRoutine::ammarkpos, CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, RelationData::rd_indam, and SCAN_CHECKS.

Referenced by ExecIndexMarkPos(), and ExecIndexOnlyMarkPos().

index_opclass_options()

bytea* index_opclass_options	(	Relation	indrel,
		AttrNumber	attnum,
		Datum	attoptions,
		bool	validate
	)

Definition at line 947 of file indexam.c.

{
    int         amoptsprocnum = indrel->rd_indam->amoptsprocnum;
    Oid         procid = InvalidOid;
    FmgrInfo   *procinfo;
    local_relopts relopts;
 
    /* fetch options support procedure if specified */
    if (amoptsprocnum != 0)
        procid = index_getprocid(indrel, attnum, amoptsprocnum);
 
    if (!OidIsValid(procid))
    {
        Oid         opclass;
        Datum       indclassDatum;
        oidvector  *indclass;
 
        if (!DatumGetPointer(attoptions))
            return NULL;        /* ok, no options, no procedure */
 
        /*
         * Report an error if the opclass's options-parsing procedure does not
         * exist but the opclass options are specified.
         */
        indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indrel->rd_indextuple,
                                               Anum_pg_index_indclass);
        indclass = (oidvector *) DatumGetPointer(indclassDatum);
        opclass = indclass->values[attnum - 1];
 
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("operator class %s has no options",
                        generate_opclass_name(opclass))));
    }
 
    init_local_reloptions(&relopts, 0);
 
    procinfo = index_getprocinfo(indrel, attnum, amoptsprocnum);
 
    (void) FunctionCall1(procinfo, PointerGetDatum(&relopts));
 
    return build_local_reloptions(&relopts, attoptions, validate);
}

References IndexAmRoutine::amoptsprocnum, attnum, build_local_reloptions(), DatumGetPointer(), ereport, errcode(), errmsg(), ERROR, FunctionCall1, generate_opclass_name(), index_getprocid(), index_getprocinfo(), INDEXRELID, init_local_reloptions(), InvalidOid, OidIsValid, PointerGetDatum(), RelationData::rd_indam, RelationData::rd_indextuple, SysCacheGetAttrNotNull(), and oidvector::values.

Referenced by index_create(), and RelationGetIndexAttOptions().

index_open()

Relation index_open	(	Oid	relationId,
		LOCKMODE	lockmode
	)

Definition at line 132 of file indexam.c.

{
    Relation    r;
 
    r = relation_open(relationId, lockmode);
 
    if (r->rd_rel->relkind != RELKIND_INDEX &&
        r->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
        ereport(ERROR,
                (errcode(ERRCODE_WRONG_OBJECT_TYPE),
                 errmsg("\"%s\" is not an index",
                        RelationGetRelationName(r))));
 
    return r;
}

References ereport, errcode(), errmsg(), ERROR, RelationData::rd_rel, relation_open(), and RelationGetRelationName.

Referenced by _bt_parallel_build_main(), ATExecAddIndex(), ATExecAddIndexConstraint(), ATExecReplicaIdentity(), AttachPartitionEnsureIndexes(), brin_desummarize_range(), brin_page_items(), brin_summarize_range(), brincostestimate(), bt_index_check_internal(), build_indices(), BuildEventTriggerCache(), check_index_is_clusterable(), CheckIndexCompatible(), copy_table_data(), DefineIndex(), DefineRelation(), DetachPartitionFinalize(), enum_endpoint(), enum_range_internal(), ExecInitBitmapIndexScan(), ExecInitIndexOnlyScan(), ExecInitIndexScan(), ExecOpenIndices(), ExecRefreshMatView(), expandTableLikeClause(), FindReplTupleInLocalRel(), FindUsableIndexForReplicaIdentityFull(), get_actual_variable_range(), get_relation_info(), gin_clean_pending_list(), gincostestimate(), gist_page_items(), hash_bitmap_info(), index_concurrently_build(), index_concurrently_create_copy(), index_concurrently_set_dead(), index_drop(), indexam_property(), infer_arbiter_indexes(), InitCatCachePhase2(), lookup_ts_config_cache(), open_lo_relation(), pg_nextoid(), pgstathashindex(), plan_create_index_workers(), refresh_by_match_merge(), reindex_index(), ReindexRelationConcurrently(), RelationFindReplTupleByIndex(), RelationGetIndexAttrBitmap(), RelationTruncateIndexes(), SetIndexStorageProperties(), systable_beginscan(), toast_open_indexes(), transformIndexConstraint(), TryReuseIndex(), vac_open_indexes(), and validate_index().

index_parallelrescan()

void index_parallelrescan

(

IndexScanDesc

scan

)

Definition at line 474 of file indexam.c.

{
    SCAN_CHECKS;
 
    if (scan->xs_heapfetch)
        table_index_fetch_reset(scan->xs_heapfetch);
 
    /* amparallelrescan is optional; assume no-op if not provided by AM */
    if (scan->indexRelation->rd_indam->amparallelrescan != NULL)
        scan->indexRelation->rd_indam->amparallelrescan(scan);
}

References IndexAmRoutine::amparallelrescan, IndexScanDescData::indexRelation, RelationData::rd_indam, SCAN_CHECKS, table_index_fetch_reset(), and IndexScanDescData::xs_heapfetch.

Referenced by ExecIndexOnlyScanReInitializeDSM(), and ExecIndexScanReInitializeDSM().

index_parallelscan_estimate()

Size index_parallelscan_estimate	(	Relation	indexRelation,
		Snapshot	snapshot
	)

Definition at line 406 of file indexam.c.

{
    Size        nbytes;
 
    Assert(snapshot != InvalidSnapshot);
 
    RELATION_CHECKS;
 
    nbytes = offsetof(ParallelIndexScanDescData, ps_snapshot_data);
    nbytes = add_size(nbytes, EstimateSnapshotSpace(snapshot));
    nbytes = MAXALIGN(nbytes);
 
    /*
     * If amestimateparallelscan is not provided, assume there is no
     * AM-specific data needed.  (It's hard to believe that could work, but
     * it's easy enough to cater to it here.)
     */
    if (indexRelation->rd_indam->amestimateparallelscan != NULL)
        nbytes = add_size(nbytes,
                          indexRelation->rd_indam->amestimateparallelscan());
 
    return nbytes;
}

References add_size(), IndexAmRoutine::amestimateparallelscan, Assert(), EstimateSnapshotSpace(), InvalidSnapshot, MAXALIGN, RelationData::rd_indam, and RELATION_CHECKS.

Referenced by ExecIndexOnlyScanEstimate(), and ExecIndexScanEstimate().

index_parallelscan_initialize()

void index_parallelscan_initialize	(	Relation	heapRelation,
		Relation	indexRelation,
		Snapshot	snapshot,
		ParallelIndexScanDesc	target
	)

Definition at line 441 of file indexam.c.

{
    Size        offset;
 
    Assert(snapshot != InvalidSnapshot);
 
    RELATION_CHECKS;
 
    offset = add_size(offsetof(ParallelIndexScanDescData, ps_snapshot_data),
                      EstimateSnapshotSpace(snapshot));
    offset = MAXALIGN(offset);
 
    target->ps_relid = RelationGetRelid(heapRelation);
    target->ps_indexid = RelationGetRelid(indexRelation);
    target->ps_offset = offset;
    SerializeSnapshot(snapshot, target->ps_snapshot_data);
 
    /* aminitparallelscan is optional; assume no-op if not provided by AM */
    if (indexRelation->rd_indam->aminitparallelscan != NULL)
    {
        void       *amtarget;
 
        amtarget = OffsetToPointer(target, offset);
        indexRelation->rd_indam->aminitparallelscan(amtarget);
    }
}

References add_size(), IndexAmRoutine::aminitparallelscan, Assert(), EstimateSnapshotSpace(), InvalidSnapshot, MAXALIGN, OffsetToPointer, ParallelIndexScanDescData::ps_indexid, ParallelIndexScanDescData::ps_offset, ParallelIndexScanDescData::ps_relid, ParallelIndexScanDescData::ps_snapshot_data, RelationData::rd_indam, RELATION_CHECKS, RelationGetRelid, and SerializeSnapshot().

Referenced by ExecIndexOnlyScanInitializeDSM(), and ExecIndexScanInitializeDSM().

index_rescan()

void index_rescan	(	IndexScanDesc	scan,
		ScanKey	keys,
		int	nkeys,
		ScanKey	orderbys,
		int	norderbys
	)

Definition at line 301 of file indexam.c.

{
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(amrescan);
 
    Assert(nkeys == scan->numberOfKeys);
    Assert(norderbys == scan->numberOfOrderBys);
 
    /* Release resources (like buffer pins) from table accesses */
    if (scan->xs_heapfetch)
        table_index_fetch_reset(scan->xs_heapfetch);
 
    scan->kill_prior_tuple = false; /* for safety */
    scan->xs_heap_continue = false;
 
    scan->indexRelation->rd_indam->amrescan(scan, keys, nkeys,
                                            orderbys, norderbys);
}

References IndexAmRoutine::amrescan, Assert(), CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, IndexScanDescData::kill_prior_tuple, IndexScanDescData::numberOfKeys, IndexScanDescData::numberOfOrderBys, RelationData::rd_indam, SCAN_CHECKS, table_index_fetch_reset(), IndexScanDescData::xs_heap_continue, and IndexScanDescData::xs_heapfetch.

Referenced by check_exclusion_or_unique_constraint(), ExecIndexOnlyScanInitializeDSM(), ExecIndexOnlyScanInitializeWorker(), ExecIndexScanInitializeDSM(), ExecIndexScanInitializeWorker(), ExecInitBitmapIndexScan(), ExecReScanBitmapIndexScan(), ExecReScanIndexOnlyScan(), ExecReScanIndexScan(), get_actual_variable_endpoint(), heapam_relation_copy_for_cluster(), IndexNext(), IndexNextWithReorder(), IndexOnlyNext(), MultiExecBitmapIndexScan(), RelationFindReplTupleByIndex(), systable_beginscan(), and systable_beginscan_ordered().

index_restrpos()

void index_restrpos

(

IndexScanDesc

scan

)

Definition at line 381 of file indexam.c.

{
    Assert(IsMVCCSnapshot(scan->xs_snapshot));
 
    SCAN_CHECKS;
    CHECK_SCAN_PROCEDURE(amrestrpos);
 
    /* release resources (like buffer pins) from table accesses */
    if (scan->xs_heapfetch)
        table_index_fetch_reset(scan->xs_heapfetch);
 
    scan->kill_prior_tuple = false; /* for safety */
    scan->xs_heap_continue = false;
 
    scan->indexRelation->rd_indam->amrestrpos(scan);
}

References IndexAmRoutine::amrestrpos, Assert(), CHECK_SCAN_PROCEDURE, IndexScanDescData::indexRelation, IsMVCCSnapshot, IndexScanDescData::kill_prior_tuple, RelationData::rd_indam, SCAN_CHECKS, table_index_fetch_reset(), IndexScanDescData::xs_heap_continue, IndexScanDescData::xs_heapfetch, and IndexScanDescData::xs_snapshot.

Referenced by ExecIndexOnlyRestrPos(), and ExecIndexRestrPos().

index_store_float8_orderby_distances()

void index_store_float8_orderby_distances	(	IndexScanDesc	scan,
		Oid *	orderByTypes,
		IndexOrderByDistance *	distances,
		bool	recheckOrderBy
	)

Definition at line 879 of file indexam.c.

{
    int         i;
 
    Assert(distances || !recheckOrderBy);
 
    scan->xs_recheckorderby = recheckOrderBy;
 
    for (i = 0; i < scan->numberOfOrderBys; i++)
    {
        if (orderByTypes[i] == FLOAT8OID)
        {
#ifndef USE_FLOAT8_BYVAL
            /* must free any old value to avoid memory leakage */
            if (!scan->xs_orderbynulls[i])
                pfree(DatumGetPointer(scan->xs_orderbyvals[i]));
#endif
            if (distances && !distances[i].isnull)
            {
                scan->xs_orderbyvals[i] = Float8GetDatum(distances[i].value);
                scan->xs_orderbynulls[i] = false;
            }
            else
            {
                scan->xs_orderbyvals[i] = (Datum) 0;
                scan->xs_orderbynulls[i] = true;
            }
        }
        else if (orderByTypes[i] == FLOAT4OID)
        {
            /* convert distance function's result to ORDER BY type */
            if (distances && !distances[i].isnull)
            {
                scan->xs_orderbyvals[i] = Float4GetDatum((float4) distances[i].value);
                scan->xs_orderbynulls[i] = false;
            }
            else
            {
                scan->xs_orderbyvals[i] = (Datum) 0;
                scan->xs_orderbynulls[i] = true;
            }
        }
        else
        {
            /*
             * If the ordering operator's return value is anything else, we
             * don't know how to convert the float8 bound calculated by the
             * distance function to that.  The executor won't actually need
             * the order by values we return here, if there are no lossy
             * results, so only insist on converting if the *recheck flag is
             * set.
             */
            if (scan->xs_recheckorderby)
                elog(ERROR, "ORDER BY operator must return float8 or float4 if the distance function is lossy");
            scan->xs_orderbynulls[i] = true;
        }
    }
}

References Assert(), DatumGetPointer(), elog(), ERROR, Float4GetDatum(), Float8GetDatum(), i, IndexScanDescData::numberOfOrderBys, pfree(), value, IndexScanDescData::xs_orderbynulls, IndexScanDescData::xs_orderbyvals, and IndexScanDescData::xs_recheckorderby.

Referenced by getNextNearest(), and spggettuple().

index_vacuum_cleanup()

IndexBulkDeleteResult* index_vacuum_cleanup	(	IndexVacuumInfo *	info,
		IndexBulkDeleteResult *	istat
	)

Definition at line 720 of file indexam.c.

{
    Relation    indexRelation = info->index;
 
    RELATION_CHECKS;
    CHECK_REL_PROCEDURE(amvacuumcleanup);
 
    return indexRelation->rd_indam->amvacuumcleanup(info, istat);
}

References IndexAmRoutine::amvacuumcleanup, CHECK_REL_PROCEDURE, IndexVacuumInfo::index, RelationData::rd_indam, and RELATION_CHECKS.

Referenced by do_analyze_rel(), and vac_cleanup_one_index().

IndexScanEnd()

void IndexScanEnd

(

IndexScanDesc

scan

)

Definition at line 145 of file genam.c.

{
    if (scan->keyData != NULL)
        pfree(scan->keyData);
    if (scan->orderByData != NULL)
        pfree(scan->orderByData);
 
    pfree(scan);
}

References IndexScanDescData::keyData, IndexScanDescData::orderByData, and pfree().

Referenced by index_endscan().

RelationGetIndexScan()

IndexScanDesc RelationGetIndexScan	(	Relation	indexRelation,
		int	nkeys,
		int	norderbys
	)

Definition at line 81 of file genam.c.

{
    IndexScanDesc scan;
 
    scan = (IndexScanDesc) palloc(sizeof(IndexScanDescData));
 
    scan->heapRelation = NULL;  /* may be set later */
    scan->xs_heapfetch = NULL;
    scan->indexRelation = indexRelation;
    scan->xs_snapshot = InvalidSnapshot;    /* caller must initialize this */
    scan->numberOfKeys = nkeys;
    scan->numberOfOrderBys = norderbys;
 
    /*
     * We allocate key workspace here, but it won't get filled until amrescan.
     */
    if (nkeys > 0)
        scan->keyData = (ScanKey) palloc(sizeof(ScanKeyData) * nkeys);
    else
        scan->keyData = NULL;
    if (norderbys > 0)
        scan->orderByData = (ScanKey) palloc(sizeof(ScanKeyData) * norderbys);
    else
        scan->orderByData = NULL;
 
    scan->xs_want_itup = false; /* may be set later */
 
    /*
     * During recovery we ignore killed tuples and don't bother to kill them
     * either. We do this because the xmin on the primary node could easily be
     * later than the xmin on the standby node, so that what the primary
     * thinks is killed is supposed to be visible on standby. So for correct
     * MVCC for queries during recovery we must ignore these hints and check
     * all tuples. Do *not* set ignore_killed_tuples to true when running in a
     * transaction that was started during recovery. xactStartedInRecovery
     * should not be altered by index AMs.
     */
    scan->kill_prior_tuple = false;
    scan->xactStartedInRecovery = TransactionStartedDuringRecovery();
    scan->ignore_killed_tuples = !scan->xactStartedInRecovery;
 
    scan->opaque = NULL;
 
    scan->xs_itup = NULL;
    scan->xs_itupdesc = NULL;
    scan->xs_hitup = NULL;
    scan->xs_hitupdesc = NULL;
 
    return scan;
}

References IndexScanDescData::heapRelation, IndexScanDescData::ignore_killed_tuples, IndexScanDescData::indexRelation, InvalidSnapshot, IndexScanDescData::keyData, IndexScanDescData::kill_prior_tuple, IndexScanDescData::numberOfKeys, IndexScanDescData::numberOfOrderBys, IndexScanDescData::opaque, IndexScanDescData::orderByData, palloc(), TransactionStartedDuringRecovery(), IndexScanDescData::xactStartedInRecovery, IndexScanDescData::xs_heapfetch, IndexScanDescData::xs_hitup, IndexScanDescData::xs_hitupdesc, IndexScanDescData::xs_itup, IndexScanDescData::xs_itupdesc, IndexScanDescData::xs_snapshot, and IndexScanDescData::xs_want_itup.

Referenced by blbeginscan(), brinbeginscan(), btbeginscan(), dibeginscan(), ginbeginscan(), gistbeginscan(), hashbeginscan(), and spgbeginscan().

systable_beginscan()

SysScanDesc systable_beginscan	(	Relation	heapRelation,
		Oid	indexId,
		bool	indexOK,
		Snapshot	snapshot,
		int	nkeys,
		ScanKey	key
	)

Definition at line 387 of file genam.c.

{
    SysScanDesc sysscan;
    Relation    irel;
 
    if (indexOK &&
        !IgnoreSystemIndexes &&
        !ReindexIsProcessingIndex(indexId))
        irel = index_open(indexId, AccessShareLock);
    else
        irel = NULL;
 
    sysscan = (SysScanDesc) palloc(sizeof(SysScanDescData));
 
    sysscan->heap_rel = heapRelation;
    sysscan->irel = irel;
    sysscan->slot = table_slot_create(heapRelation, NULL);
 
    if (snapshot == NULL)
    {
        Oid         relid = RelationGetRelid(heapRelation);
 
        snapshot = RegisterSnapshot(GetCatalogSnapshot(relid));
        sysscan->snapshot = snapshot;
    }
    else
    {
        /* Caller is responsible for any snapshot. */
        sysscan->snapshot = NULL;
    }
 
    if (irel)
    {
        int         i;
 
        /* Change attribute numbers to be index column numbers. */
        for (i = 0; i < nkeys; i++)
        {
            int         j;
 
            for (j = 0; j < IndexRelationGetNumberOfAttributes(irel); j++)
            {
                if (key[i].sk_attno == irel->rd_index->indkey.values[j])
                {
                    key[i].sk_attno = j + 1;
                    break;
                }
            }
            if (j == IndexRelationGetNumberOfAttributes(irel))
                elog(ERROR, "column is not in index");
        }
 
        sysscan->iscan = index_beginscan(heapRelation, irel,
                                         snapshot, nkeys, 0);
        index_rescan(sysscan->iscan, key, nkeys, NULL, 0);
        sysscan->scan = NULL;
    }
    else
    {
        /*
         * We disallow synchronized scans when forced to use a heapscan on a
         * catalog.  In most cases the desired rows are near the front, so
         * that the unpredictable start point of a syncscan is a serious
         * disadvantage; and there are no compensating advantages, because
         * it's unlikely that such scans will occur in parallel.
         */
        sysscan->scan = table_beginscan_strat(heapRelation, snapshot,
                                              nkeys, key,
                                              true, false);
        sysscan->iscan = NULL;
    }
 
    /*
     * If CheckXidAlive is set then set a flag to indicate that system table
     * scan is in-progress.  See detailed comments in xact.c where these
     * variables are declared.
     */
    if (TransactionIdIsValid(CheckXidAlive))
        bsysscan = true;
 
    return sysscan;
}

References AccessShareLock, bsysscan, CheckXidAlive, elog(), ERROR, GetCatalogSnapshot(), SysScanDescData::heap_rel, i, IgnoreSystemIndexes, index_beginscan(), index_open(), index_rescan(), IndexRelationGetNumberOfAttributes, SysScanDescData::irel, SysScanDescData::iscan, j, sort-test::key, palloc(), RelationData::rd_index, RegisterSnapshot(), ReindexIsProcessingIndex(), RelationGetRelid, SysScanDescData::scan, SysScanDescData::slot, SysScanDescData::snapshot, table_beginscan_strat(), table_slot_create(), and TransactionIdIsValid.

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAlterConstrRecurse(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecSetNotNull(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findNotNullConstraintAttnum(), get_catalog_object_by_oid(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_extension_name(), get_extension_oid(), get_extension_schema(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExists(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), myLargeObjectExists(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

systable_beginscan_ordered()

SysScanDesc systable_beginscan_ordered	(	Relation	heapRelation,
		Relation	indexRelation,
		Snapshot	snapshot,
		int	nkeys,
		ScanKey	key
	)

Definition at line 646 of file genam.c.

{
    SysScanDesc sysscan;
    int         i;
 
    /* REINDEX can probably be a hard error here ... */
    if (ReindexIsProcessingIndex(RelationGetRelid(indexRelation)))
        elog(ERROR, "cannot do ordered scan on index \"%s\", because it is being reindexed",
             RelationGetRelationName(indexRelation));
    /* ... but we only throw a warning about violating IgnoreSystemIndexes */
    if (IgnoreSystemIndexes)
        elog(WARNING, "using index \"%s\" despite IgnoreSystemIndexes",
             RelationGetRelationName(indexRelation));
 
    sysscan = (SysScanDesc) palloc(sizeof(SysScanDescData));
 
    sysscan->heap_rel = heapRelation;
    sysscan->irel = indexRelation;
    sysscan->slot = table_slot_create(heapRelation, NULL);
 
    if (snapshot == NULL)
    {
        Oid         relid = RelationGetRelid(heapRelation);
 
        snapshot = RegisterSnapshot(GetCatalogSnapshot(relid));
        sysscan->snapshot = snapshot;
    }
    else
    {
        /* Caller is responsible for any snapshot. */
        sysscan->snapshot = NULL;
    }
 
    /* Change attribute numbers to be index column numbers. */
    for (i = 0; i < nkeys; i++)
    {
        int         j;
 
        for (j = 0; j < IndexRelationGetNumberOfAttributes(indexRelation); j++)
        {
            if (key[i].sk_attno == indexRelation->rd_index->indkey.values[j])
            {
                key[i].sk_attno = j + 1;
                break;
            }
        }
        if (j == IndexRelationGetNumberOfAttributes(indexRelation))
            elog(ERROR, "column is not in index");
    }
 
    sysscan->iscan = index_beginscan(heapRelation, indexRelation,
                                     snapshot, nkeys, 0);
    index_rescan(sysscan->iscan, key, nkeys, NULL, 0);
    sysscan->scan = NULL;
 
    return sysscan;
}

References elog(), ERROR, GetCatalogSnapshot(), SysScanDescData::heap_rel, i, IgnoreSystemIndexes, index_beginscan(), index_rescan(), IndexRelationGetNumberOfAttributes, SysScanDescData::irel, SysScanDescData::iscan, j, sort-test::key, palloc(), RelationData::rd_index, RegisterSnapshot(), ReindexIsProcessingIndex(), RelationGetRelationName, RelationGetRelid, SysScanDescData::scan, SysScanDescData::slot, SysScanDescData::snapshot, table_slot_create(), and WARNING.

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

systable_endscan()

void systable_endscan

(

SysScanDesc

sysscan

)

Definition at line 599 of file genam.c.

{
    if (sysscan->slot)
    {
        ExecDropSingleTupleTableSlot(sysscan->slot);
        sysscan->slot = NULL;
    }
 
    if (sysscan->irel)
    {
        index_endscan(sysscan->iscan);
        index_close(sysscan->irel, AccessShareLock);
    }
    else
        table_endscan(sysscan->scan);
 
    if (sysscan->snapshot)
        UnregisterSnapshot(sysscan->snapshot);
 
    /*
     * Reset the bsysscan flag at the end of the systable scan.  See detailed
     * comments in xact.c where these variables are declared.
     */
    if (TransactionIdIsValid(CheckXidAlive))
        bsysscan = false;
 
    pfree(sysscan);
}

References AccessShareLock, bsysscan, CheckXidAlive, ExecDropSingleTupleTableSlot(), index_close(), index_endscan(), SysScanDescData::irel, SysScanDescData::iscan, pfree(), SysScanDescData::scan, SysScanDescData::slot, SysScanDescData::snapshot, table_endscan(), TransactionIdIsValid, and UnregisterSnapshot().

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAlterConstrRecurse(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecSetNotNull(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findNotNullConstraintAttnum(), get_catalog_object_by_oid(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_extension_name(), get_extension_oid(), get_extension_schema(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExists(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), myLargeObjectExists(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

systable_endscan_ordered()

void systable_endscan_ordered

(

SysScanDesc

sysscan

)

Definition at line 736 of file genam.c.

{
    if (sysscan->slot)
    {
        ExecDropSingleTupleTableSlot(sysscan->slot);
        sysscan->slot = NULL;
    }
 
    Assert(sysscan->irel);
    index_endscan(sysscan->iscan);
    if (sysscan->snapshot)
        UnregisterSnapshot(sysscan->snapshot);
    pfree(sysscan);
}

References Assert(), ExecDropSingleTupleTableSlot(), index_endscan(), SysScanDescData::irel, SysScanDescData::iscan, pfree(), SysScanDescData::slot, SysScanDescData::snapshot, and UnregisterSnapshot().

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

systable_getnext()

HeapTuple systable_getnext

(

SysScanDesc

sysscan

)

Definition at line 506 of file genam.c.

{
    HeapTuple   htup = NULL;
 
    if (sysscan->irel)
    {
        if (index_getnext_slot(sysscan->iscan, ForwardScanDirection, sysscan->slot))
        {
            bool        shouldFree;
 
            htup = ExecFetchSlotHeapTuple(sysscan->slot, false, &shouldFree);
            Assert(!shouldFree);
 
            /*
             * We currently don't need to support lossy index operators for
             * any system catalog scan.  It could be done here, using the scan
             * keys to drive the operator calls, if we arranged to save the
             * heap attnums during systable_beginscan(); this is practical
             * because we still wouldn't need to support indexes on
             * expressions.
             */
            if (sysscan->iscan->xs_recheck)
                elog(ERROR, "system catalog scans with lossy index conditions are not implemented");
        }
    }
    else
    {
        if (table_scan_getnextslot(sysscan->scan, ForwardScanDirection, sysscan->slot))
        {
            bool        shouldFree;
 
            htup = ExecFetchSlotHeapTuple(sysscan->slot, false, &shouldFree);
            Assert(!shouldFree);
        }
    }
 
    /*
     * Handle the concurrent abort while fetching the catalog tuple during
     * logical streaming of a transaction.
     */
    HandleConcurrentAbort();
 
    return htup;
}

References Assert(), elog(), ERROR, ExecFetchSlotHeapTuple(), ForwardScanDirection, HandleConcurrentAbort(), index_getnext_slot(), SysScanDescData::irel, SysScanDescData::iscan, SysScanDescData::scan, SysScanDescData::slot, table_scan_getnextslot(), and IndexScanDescData::xs_recheck.

Referenced by AfterTriggerSetState(), AlterConstraintNamespaces(), AlterDatabase(), AlterDatabaseOwner(), AlterDatabaseRefreshColl(), AlterDomainDropConstraint(), AlterDomainValidateConstraint(), AlterExtensionNamespace(), AlterPolicy(), AlterSeqNamespaces(), AlterSetting(), AlterTypeRecurse(), ApplyExtensionUpdates(), ApplySetting(), ATExecAddOf(), ATExecAlterColumnType(), ATExecAlterConstraint(), ATExecAlterConstrRecurse(), ATExecAttachPartition(), ATExecDropConstraint(), ATExecSetNotNull(), ATExecValidateConstraint(), ATPrepChangePersistence(), AttrDefaultFetch(), change_owner_fix_column_acls(), change_owner_recurse_to_sequences(), changeDependenciesOf(), changeDependenciesOn(), changeDependencyFor(), CheckConstraintFetch(), checkSharedDependencies(), ChooseConstraintName(), CloneFkReferenced(), CloneRowTriggersToPartition(), ConstraintNameExists(), ConstraintNameIsUsed(), CopyStatistics(), copyTemplateDependencies(), CountDBSubscriptions(), CreateComments(), CreateInheritance(), CreatePolicy(), CreateSharedComments(), CreateTriggerFiringOn(), DefineOpClass(), DefineTSConfiguration(), DeleteAttributeTuples(), DeleteComments(), deleteDependencyRecordsFor(), deleteDependencyRecordsForClass(), deleteDependencyRecordsForSpecific(), DeleteInheritsTuple(), DeleteInitPrivs(), deleteOneObject(), DeleteSecurityLabel(), DeleteSharedComments(), DeleteSharedSecurityLabel(), DeleteSystemAttributeTuples(), drop_parent_dependency(), DropClonedTriggersFromPartition(), DropConfigurationMapping(), dropconstraint_internal(), dropDatabaseDependencies(), DropObjectById(), DropRole(), EnableDisableTrigger(), EnumValuesDelete(), exec_object_restorecon(), ExecAlterExtensionStmt(), ExecGrant_Largeobject(), extension_config_remove(), fetch_statentries_for_relation(), find_composite_type_dependencies(), find_inheritance_children_extended(), findDependentObjects(), findNotNullConstraintAttnum(), get_catalog_object_by_oid(), get_database_oid(), get_db_info(), get_domain_constraint_oid(), get_extension_name(), get_extension_oid(), get_extension_schema(), get_index_constraint(), get_index_ref_constraints(), get_partition_parent_worker(), get_pkey_attnames(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_constraint_oid(), get_relation_idx_constraint_oid(), get_relation_policy_oid(), get_rels_with_domain(), get_trigger_oid(), GetAllTablesPublications(), GetAttrDefaultColumnAddress(), GetAttrDefaultOid(), getAutoExtensionsOfObject(), GetComment(), GetDatabaseTuple(), GetDatabaseTupleByOid(), GetDefaultOpClass(), getExtensionOfObject(), GetForeignKeyActionTriggers(), GetForeignKeyCheckTriggers(), GetNewOidWithIndex(), getObjectDescription(), getObjectIdentityParts(), getOwnedSequences_internal(), GetParentedForeignKeyRefs(), GetPublicationRelations(), GetPublicationSchemas(), GetSecurityLabel(), GetSharedSecurityLabel(), GetSubscriptionRelations(), has_superclass(), HasSubscriptionRelations(), heap_truncate_find_FKs(), index_concurrently_swap(), IndexSetParentIndex(), is_schema_publication(), LargeObjectDrop(), LargeObjectExists(), load_domaintype_info(), load_enum_cache_data(), LookupOpclassInfo(), makeConfigurationDependencies(), MakeConfigurationMapping(), MarkInheritDetached(), MergeConstraintsIntoExisting(), MergeWithExistingConstraint(), movedb(), myLargeObjectExists(), object_ownercheck(), PartitionHasPendingDetach(), pg_extension_config_dump(), pg_get_constraintdef_worker(), pg_get_serial_sequence(), pg_get_triggerdef_worker(), pg_largeobject_aclmask_snapshot(), RangeDelete(), recordExtensionInitPrivWorker(), recordExtObjInitPriv(), relation_has_policies(), RelationBuildPartitionDesc(), RelationBuildRowSecurity(), RelationBuildRuleLock(), RelationBuildTriggers(), RelationBuildTupleDesc(), RelationGetExclusionInfo(), RelationGetFKeyList(), RelationGetIndexList(), RelationGetNotNullConstraints(), RelationGetStatExtList(), RelationRemoveInheritance(), RelidByRelfilenumber(), RemoveAttrDefault(), RemoveAttrDefaultById(), RemoveExtensionById(), RemoveInheritance(), RemovePolicyById(), RemoveRewriteRuleById(), RemoveRoleFromObjectACL(), RemoveRoleFromObjectPolicy(), RemoveStatistics(), RemoveTriggerById(), RemoveTSConfigurationById(), rename_policy(), renametrig(), renametrig_internal(), renametrig_partition(), replorigin_create(), ScanPgRelation(), SearchCatCacheList(), SearchCatCacheMiss(), sepgsql_attribute_post_create(), sepgsql_database_post_create(), sepgsql_proc_post_create(), sepgsql_proc_setattr(), sepgsql_relation_post_create(), sepgsql_relation_setattr(), sepgsql_relation_setattr_extra(), sepgsql_schema_post_create(), sequenceIsOwned(), SetSecurityLabel(), SetSharedSecurityLabel(), shdepChangeDep(), shdepDropDependency(), shdepDropOwned(), shdepReassignOwned(), toastrel_valueid_exists(), TriggerSetParentTrigger(), tryAttachPartitionForeignKey(), typeInheritsFrom(), vac_update_datfrozenxid(), and validatePartitionedIndex().

systable_getnext_ordered()

HeapTuple systable_getnext_ordered	(	SysScanDesc	sysscan,
		ScanDirection	direction
	)

Definition at line 711 of file genam.c.

{
    HeapTuple   htup = NULL;
 
    Assert(sysscan->irel);
    if (index_getnext_slot(sysscan->iscan, direction, sysscan->slot))
        htup = ExecFetchSlotHeapTuple(sysscan->slot, false, NULL);
 
    /* See notes in systable_getnext */
    if (htup && sysscan->iscan->xs_recheck)
        elog(ERROR, "system catalog scans with lossy index conditions are not implemented");
 
    /*
     * Handle the concurrent abort while fetching the catalog tuple during
     * logical streaming of a transaction.
     */
    HandleConcurrentAbort();
 
    return htup;
}

References Assert(), elog(), ERROR, ExecFetchSlotHeapTuple(), HandleConcurrentAbort(), index_getnext_slot(), SysScanDescData::irel, SysScanDescData::iscan, SysScanDescData::slot, and IndexScanDescData::xs_recheck.

Referenced by BuildEventTriggerCache(), check_toasted_attribute(), enum_endpoint(), enum_range_internal(), heap_fetch_toast_slice(), inv_getsize(), inv_read(), inv_truncate(), inv_write(), lookup_ts_config_cache(), and toast_delete_datum().

systable_recheck_tuple()

bool systable_recheck_tuple	(	SysScanDesc	sysscan,
		HeapTuple	tup
	)

Definition at line 565 of file genam.c.

{
    Snapshot    freshsnap;
    bool        result;
 
    Assert(tup == ExecFetchSlotHeapTuple(sysscan->slot, false, NULL));
 
    /*
     * Trust that table_tuple_satisfies_snapshot() and its subsidiaries
     * (commonly LockBuffer() and HeapTupleSatisfiesMVCC()) do not themselves
     * acquire snapshots, so we need not register the snapshot.  Those
     * facilities are too low-level to have any business scanning tables.
     */
    freshsnap = GetCatalogSnapshot(RelationGetRelid(sysscan->heap_rel));
 
    result = table_tuple_satisfies_snapshot(sysscan->heap_rel,
                                            sysscan->slot,
                                            freshsnap);
 
    /*
     * Handle the concurrent abort while fetching the catalog tuple during
     * logical streaming of a transaction.
     */
    HandleConcurrentAbort();
 
    return result;
}

References Assert(), ExecFetchSlotHeapTuple(), GetCatalogSnapshot(), HandleConcurrentAbort(), SysScanDescData::heap_rel, RelationGetRelid, SysScanDescData::slot, and table_tuple_satisfies_snapshot().

Referenced by findDependentObjects(), and shdepDropOwned().