* POSTGRES relation descriptor (a/k/a relcache entry) definitions.
*
*
- * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: rel.h,v 1.44 2001/01/24 19:43:29 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.93 2006/12/23 00:43:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef REL_H
#define REL_H
-#include "access/strat.h"
#include "access/tupdesc.h"
#include "catalog/pg_am.h"
#include "catalog/pg_class.h"
+#include "catalog/pg_index.h"
+#include "fmgr.h"
#include "rewrite/prs2lock.h"
+#include "storage/block.h"
#include "storage/relfilenode.h"
-#include "storage/fd.h"
-/* added to prevent circular dependency. bjm 1999/11/15 */
-extern char *get_temp_rel_by_physicalname(const char *relname);
/*
* LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
* Likewise, this struct really belongs to trigger.h, but for convenience
* we put it here.
*/
-
typedef struct Trigger
{
- Oid tgoid;
+ Oid tgoid; /* OID of trigger (pg_trigger row) */
+ /* Remaining fields are copied from pg_trigger, see pg_trigger.h */
char *tgname;
Oid tgfoid;
- FmgrInfo tgfunc;
int16 tgtype;
bool tgenabled;
bool tgisconstraint;
+ Oid tgconstrrelid;
bool tgdeferrable;
bool tginitdeferred;
int16 tgnargs;
- int16 tgattr[FUNC_MAX_ARGS];
+ int16 tgnattr;
+ int16 *tgattr;
char **tgargs;
} Trigger;
typedef struct TriggerDesc
{
- /* index data to identify which triggers are which */
- uint16 n_before_statement[4];
- uint16 n_before_row[4];
- uint16 n_after_row[4];
- uint16 n_after_statement[4];
- Trigger **tg_before_statement[4];
- Trigger **tg_before_row[4];
- Trigger **tg_after_row[4];
- Trigger **tg_after_statement[4];
- /* the actual array of triggers is here */
+ /*
+ * Index data to identify which triggers are which. Since each trigger
+ * can appear in more than one class, for each class we provide a list of
+ * integer indexes into the triggers array.
+ */
+#define TRIGGER_NUM_EVENT_CLASSES 3
+
+ uint16 n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
+ uint16 n_before_row[TRIGGER_NUM_EVENT_CLASSES];
+ uint16 n_after_row[TRIGGER_NUM_EVENT_CLASSES];
+ uint16 n_after_statement[TRIGGER_NUM_EVENT_CLASSES];
+ int *tg_before_statement[TRIGGER_NUM_EVENT_CLASSES];
+ int *tg_before_row[TRIGGER_NUM_EVENT_CLASSES];
+ int *tg_after_row[TRIGGER_NUM_EVENT_CLASSES];
+ int *tg_after_statement[TRIGGER_NUM_EVENT_CLASSES];
+
+ /* The actual array of triggers is here */
Trigger *triggers;
int numtriggers;
} TriggerDesc;
+
+/*
+ * Same for the statistics collector data in Relation and scan data.
+ */
+typedef struct PgStat_Info
+{
+ void *tabentry;
+} PgStat_Info;
+
+
+/*
+ * Cached lookup information for the index access method functions defined
+ * by the pg_am row associated with an index relation.
+ */
+typedef struct RelationAmInfo
+{
+ FmgrInfo aminsert;
+ FmgrInfo ambeginscan;
+ FmgrInfo amgettuple;
+ FmgrInfo amgetmulti;
+ FmgrInfo amrescan;
+ FmgrInfo amendscan;
+ FmgrInfo ammarkpos;
+ FmgrInfo amrestrpos;
+ FmgrInfo ambuild;
+ FmgrInfo ambulkdelete;
+ FmgrInfo amvacuumcleanup;
+ FmgrInfo amcostestimate;
+ FmgrInfo amoptions;
+} RelationAmInfo;
+
+
/*
* Here are the contents of a relation cache entry.
*/
typedef struct RelationData
{
- File rd_fd; /* open file descriptor, or -1 if none */
- RelFileNode rd_node; /* relation file node */
- int rd_nblocks; /* number of blocks in rel */
- uint16 rd_refcnt; /* reference count */
- bool rd_myxactonly; /* rel uses the local buffer mgr */
+ RelFileNode rd_node; /* relation physical identifier */
+ /* use "struct" here to avoid needing to include smgr.h: */
+ struct SMgrRelationData *rd_smgr; /* cached file handle, or NULL */
+ BlockNumber rd_targblock; /* current insertion target block, or
+ * InvalidBlockNumber */
+ int rd_refcnt; /* reference count */
+ bool rd_istemp; /* rel uses the local buffer mgr */
bool rd_isnailed; /* rel is nailed in cache */
- bool rd_indexfound; /* true if rd_indexlist is valid */
- bool rd_uniqueindex; /* true if rel is a UNIQUE index */
- Form_pg_am rd_am; /* AM tuple */
+ bool rd_isvalid; /* relcache entry is valid */
+ char rd_indexvalid; /* state of rd_indexlist: 0 = not valid, 1 =
+ * valid, 2 = temporarily forced */
+ SubTransactionId rd_createSubid; /* rel was created in current xact */
+
+ /*
+ * rd_createSubid is the ID of the highest subtransaction the rel has
+ * survived into; or zero if the rel was not created in the current top
+ * transaction. This should be relied on only for optimization purposes;
+ * it is possible for new-ness to be "forgotten" (eg, after CLUSTER).
+ */
Form_pg_class rd_rel; /* RELATION tuple */
+ TupleDesc rd_att; /* tuple descriptor */
Oid rd_id; /* relation's object id */
List *rd_indexlist; /* list of OIDs of indexes on relation */
+ Oid rd_oidindex; /* OID of unique index on OID, if any */
LockInfoData rd_lockInfo; /* lock mgr's info for locking relation */
- TupleDesc rd_att; /* tuple descriptor */
RuleLock *rd_rules; /* rewrite rules */
MemoryContext rd_rulescxt; /* private memory cxt for rd_rules, if any */
- IndexStrategy rd_istrat; /* info needed if rel is an index */
- RegProcedure *rd_support;
TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */
+
+ /*
+ * rd_options is set whenever rd_rel is loaded into the relcache entry.
+ * Note that you can NOT look into rd_rel for this data. NULL means "use
+ * defaults".
+ */
+ bytea *rd_options; /* parsed pg_class.reloptions */
+
+ /* These are non-NULL only for an index relation: */
+ Form_pg_index rd_index; /* pg_index tuple describing this index */
+ struct HeapTupleData *rd_indextuple; /* all of pg_index tuple */
+ /* "struct HeapTupleData *" avoids need to include htup.h here */
+ Form_pg_am rd_am; /* pg_am tuple for index's AM */
+
+ /*
+ * index access support info (used only for an index relation)
+ *
+ * Note: only default operators and support procs for each opclass are
+ * cached, namely those with lefttype and righttype equal to the opclass's
+ * opcintype. The arrays are indexed by strategy or support number,
+ * which is a sufficient identifier given that restriction.
+ *
+ * Note: rd_amcache is available for index AMs to cache private data about
+ * an index. This must be just a cache since it may get reset at any time
+ * (in particular, it will get reset by a relcache inval message for the
+ * index). If used, it must point to a single memory chunk palloc'd in
+ * rd_indexcxt. A relcache reset will include freeing that chunk and
+ * setting rd_amcache = NULL.
+ */
+ MemoryContext rd_indexcxt; /* private memory cxt for this stuff */
+ RelationAmInfo *rd_aminfo; /* lookup info for funcs found in pg_am */
+ Oid *rd_opfamily; /* OIDs of op families for each index col */
+ Oid *rd_opcintype; /* OIDs of opclass declared input data types */
+ Oid *rd_operator; /* OIDs of index operators */
+ RegProcedure *rd_support; /* OIDs of support procedures */
+ FmgrInfo *rd_supportinfo; /* lookup info for support procedures */
+ List *rd_indexprs; /* index expression trees, if any */
+ List *rd_indpred; /* index predicate tree, if any */
+ void *rd_amcache; /* available for use by index AM */
+
+ /* statistics collection area */
+ PgStat_Info pgstat_info;
} RelationData;
typedef RelationData *Relation;
/*
+ * StdRdOptions
+ * Standard contents of rd_options for heaps and generic indexes.
+ *
+ * RelationGetFillFactor() and RelationGetTargetPageFreeSpace() can only
+ * be applied to relations that use this format or a superset for
+ * private options data.
+ */
+typedef struct StdRdOptions
+{
+ int32 vl_len; /* required to be a bytea */
+ int fillfactor; /* page fill factor in percent (0..100) */
+} StdRdOptions;
+
+#define HEAP_MIN_FILLFACTOR 10
+#define HEAP_DEFAULT_FILLFACTOR 100
+
+/*
+ * RelationGetFillFactor
+ * Returns the relation's fillfactor. Note multiple eval of argument!
+ */
+#define RelationGetFillFactor(relation, defaultff) \
+ ((relation)->rd_options ? \
+ ((StdRdOptions *) (relation)->rd_options)->fillfactor : (defaultff))
+
+/*
+ * RelationGetTargetPageUsage
+ * Returns the relation's desired space usage per page in bytes.
+ */
+#define RelationGetTargetPageUsage(relation, defaultff) \
+ (BLCKSZ * RelationGetFillFactor(relation, defaultff) / 100)
+
+/*
+ * RelationGetTargetPageFreeSpace
+ * Returns the relation's desired freespace per page in bytes.
+ */
+#define RelationGetTargetPageFreeSpace(relation, defaultff) \
+ (BLCKSZ * (100 - RelationGetFillFactor(relation, defaultff)) / 100)
+
+/*
* RelationIsValid
* True iff relation descriptor is valid.
*/
((bool)((relation)->rd_refcnt == 0))
/*
- * RelationSetReferenceCount
- * Sets relation reference count.
- */
-#define RelationSetReferenceCount(relation,count) \
- ((relation)->rd_refcnt = (count))
-
-/*
- * RelationIncrementReferenceCount
- * Increments relation reference count.
- */
-#define RelationIncrementReferenceCount(relation) \
- ((relation)->rd_refcnt += 1)
-
-/*
- * RelationDecrementReferenceCount
- * Decrements relation reference count.
- */
-#define RelationDecrementReferenceCount(relation) \
- (AssertMacro((relation)->rd_refcnt > 0), \
- (relation)->rd_refcnt -= 1)
-
-/*
* RelationGetForm
* Returns pg_class tuple for a relation.
*
/*
* RelationGetRelid
- *
- * returns the OID of the relation
+ * Returns the OID of the relation
*/
#define RelationGetRelid(relation) ((relation)->rd_id)
/*
- * RelationGetFile
- *
- * Returns the open file descriptor for the rel
+ * RelationGetNumberOfAttributes
+ * Returns the number of attributes in a relation.
*/
-#define RelationGetFile(relation) ((relation)->rd_fd)
+#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
/*
- * RelationGetRelationName
- *
- * Returns the relation's logical name (as seen by the user).
- *
- * If the rel is a temp rel, the temp name will be returned. Therefore,
- * this name is not unique. But it is the name to use in heap_openr(),
- * for example.
+ * RelationGetDescr
+ * Returns tuple descriptor for a relation.
*/
-#define RelationGetRelationName(relation) \
-(\
- (strncmp(RelationGetPhysicalRelationName(relation), \
- "pg_temp.", 8) != 0) \
- ? \
- RelationGetPhysicalRelationName(relation) \
- : \
- get_temp_rel_by_physicalname( \
- RelationGetPhysicalRelationName(relation)) \
-)
-
+#define RelationGetDescr(relation) ((relation)->rd_att)
/*
- * RelationGetPhysicalRelationName
- *
- * Returns the rel's physical name, ie, the name appearing in pg_class.
- *
- * While this name is unique across all rels in the database, it is not
- * necessarily useful for accessing the rel, since a temp table of the
- * same name might mask the rel. It is useful mainly for determining if
- * the rel is a shared system rel or not.
+ * RelationGetRelationName
+ * Returns the rel's name.
*
- * The macro is rather unfortunately named, since the pg_class name no longer
- * has anything to do with the file name used for physical storage of the rel.
+ * Note that the name is only unique within the containing namespace.
*/
-#define RelationGetPhysicalRelationName(relation) \
+#define RelationGetRelationName(relation) \
(NameStr((relation)->rd_rel->relname))
/*
- * RelationGetNumberOfAttributes
- *
- * Returns the number of attributes.
+ * RelationGetNamespace
+ * Returns the rel's namespace OID.
*/
-#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
+#define RelationGetNamespace(relation) \
+ ((relation)->rd_rel->relnamespace)
/*
- * RelationGetDescr
- * Returns tuple descriptor for a relation.
+ * RelationOpenSmgr
+ * Open the relation at the smgr level, if not already done.
*/
-#define RelationGetDescr(relation) ((relation)->rd_att)
+#define RelationOpenSmgr(relation) \
+ do { \
+ if ((relation)->rd_smgr == NULL) \
+ smgrsetowner(&((relation)->rd_smgr), smgropen((relation)->rd_node)); \
+ } while (0)
/*
- * RelationGetIndexStrategy
- * Returns index strategy for a relation.
+ * RelationCloseSmgr
+ * Close the relation at the smgr level, if not already done.
*
- * Note:
- * Assumes relation descriptor is valid.
- * Assumes relation descriptor is for an index relation.
+ * Note: smgrclose should unhook from owner pointer, hence the Assert.
*/
-#define RelationGetIndexStrategy(relation) ((relation)->rd_istrat)
+#define RelationCloseSmgr(relation) \
+ do { \
+ if ((relation)->rd_smgr != NULL) \
+ { \
+ smgrclose((relation)->rd_smgr); \
+ Assert((relation)->rd_smgr == NULL); \
+ } \
+ } while (0)
/*
- * Routines in utils/cache/rel.c
+ * RELATION_IS_LOCAL
+ * If a rel is either temp or newly created in the current transaction,
+ * it can be assumed to be visible only to the current backend.
+ *
+ * Beware of multiple eval of argument
*/
-extern void RelationSetIndexSupport(Relation relation,
- IndexStrategy strategy,
- RegProcedure *support);
+#define RELATION_IS_LOCAL(relation) \
+ ((relation)->rd_istemp || \
+ (relation)->rd_createSubid != InvalidSubTransactionId)
+
+/* routines in utils/cache/relcache.c */
+extern void RelationIncrementReferenceCount(Relation rel);
+extern void RelationDecrementReferenceCount(Relation rel);
-#endif /* REL_H */
+#endif /* REL_H */
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