Adding upstream version 14.5.upstream/14.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 672 insertions, 0 deletions

diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
new file mode 100644
index 0000000..d62ac86
--- /dev/null
+++ b/src/include/utils/rel.h
@@ -0,0 +1,672 @@
+/*-------------------------------------------------------------------------
+ *
+ * rel.h
+ *	  POSTGRES relation descriptor (a/k/a relcache entry) definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/rel.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef REL_H
+#define REL_H
+
+#include "access/tupdesc.h"
+#include "access/xlog.h"
+#include "catalog/pg_class.h"
+#include "catalog/pg_index.h"
+#include "catalog/pg_publication.h"
+#include "nodes/bitmapset.h"
+#include "partitioning/partdefs.h"
+#include "rewrite/prs2lock.h"
+#include "storage/block.h"
+#include "storage/relfilenode.h"
+#include "utils/relcache.h"
+#include "utils/reltrigger.h"
+
+
+/*
+ * LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
+ * to declare them here so we can have a LockInfoData field in a Relation.
+ */
+
+typedef struct LockRelId
+{
+	Oid			relId;			/* a relation identifier */
+	Oid			dbId;			/* a database identifier */
+} LockRelId;
+
+typedef struct LockInfoData
+{
+	LockRelId	lockRelId;
+} LockInfoData;
+
+typedef LockInfoData *LockInfo;
+
+/*
+ * Here are the contents of a relation cache entry.
+ */
+
+typedef struct RelationData
+{
+	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 */
+	int			rd_refcnt;		/* reference count */
+	BackendId	rd_backend;		/* owning backend id, if temporary relation */
+	bool		rd_islocaltemp; /* rel is a temp rel of this session */
+	bool		rd_isnailed;	/* rel is nailed in cache */
+	bool		rd_isvalid;		/* relcache entry is valid */
+	bool		rd_indexvalid;	/* is rd_indexlist valid? (also rd_pkindex and
+								 * rd_replidindex) */
+	bool		rd_statvalid;	/* is rd_statlist valid? */
+
+	/*----------
+	 * rd_createSubid is the ID of the highest subtransaction the rel has
+	 * survived into or zero if the rel or its rd_node was created before the
+	 * current top transaction.  (IndexStmt.oldNode leads to the case of a new
+	 * rel with an old rd_node.)  rd_firstRelfilenodeSubid is the ID of the
+	 * highest subtransaction an rd_node change has survived into or zero if
+	 * rd_node matches the value it had at the start of the current top
+	 * transaction.  (Rolling back the subtransaction that
+	 * rd_firstRelfilenodeSubid denotes would restore rd_node to the value it
+	 * had at the start of the current top transaction.  Rolling back any
+	 * lower subtransaction would not.)  Their accuracy is critical to
+	 * RelationNeedsWAL().
+	 *
+	 * rd_newRelfilenodeSubid is the ID of the highest subtransaction the
+	 * most-recent relfilenode change has survived into or zero if not changed
+	 * in the current transaction (or we have forgotten changing it).  This
+	 * field is accurate when non-zero, but it can be zero when a relation has
+	 * multiple new relfilenodes within a single transaction, with one of them
+	 * occurring in a subsequently aborted subtransaction, e.g.
+	 *		BEGIN;
+	 *		TRUNCATE t;
+	 *		SAVEPOINT save;
+	 *		TRUNCATE t;
+	 *		ROLLBACK TO save;
+	 *		-- rd_newRelfilenodeSubid is now forgotten
+	 *
+	 * If every rd_*Subid field is zero, they are read-only outside
+	 * relcache.c.  Files that trigger rd_node changes by updating
+	 * pg_class.reltablespace and/or pg_class.relfilenode call
+	 * RelationAssumeNewRelfilenode() to update rd_*Subid.
+	 *
+	 * rd_droppedSubid is the ID of the highest subtransaction that a drop of
+	 * the rel has survived into.  In entries visible outside relcache.c, this
+	 * is always zero.
+	 */
+	SubTransactionId rd_createSubid;	/* rel was created in current xact */
+	SubTransactionId rd_newRelfilenodeSubid;	/* highest subxact changing
+												 * rd_node to current value */
+	SubTransactionId rd_firstRelfilenodeSubid;	/* highest subxact changing
+												 * rd_node to any value */
+	SubTransactionId rd_droppedSubid;	/* dropped with another Subid set */
+
+	Form_pg_class rd_rel;		/* RELATION tuple */
+	TupleDesc	rd_att;			/* tuple descriptor */
+	Oid			rd_id;			/* relation's object id */
+	LockInfoData rd_lockInfo;	/* lock mgr's info for locking relation */
+	RuleLock   *rd_rules;		/* rewrite rules */
+	MemoryContext rd_rulescxt;	/* private memory cxt for rd_rules, if any */
+	TriggerDesc *trigdesc;		/* Trigger info, or NULL if rel has none */
+	/* use "struct" here to avoid needing to include rowsecurity.h: */
+	struct RowSecurityDesc *rd_rsdesc;	/* row security policies, or NULL */
+
+	/* data managed by RelationGetFKeyList: */
+	List	   *rd_fkeylist;	/* list of ForeignKeyCacheInfo (see below) */
+	bool		rd_fkeyvalid;	/* true if list has been computed */
+
+	/* data managed by RelationGetPartitionKey: */
+	PartitionKey rd_partkey;	/* partition key, or NULL */
+	MemoryContext rd_partkeycxt;	/* private context for rd_partkey, if any */
+
+	/* data managed by RelationGetPartitionDesc: */
+	PartitionDesc rd_partdesc;	/* partition descriptor, or NULL */
+	MemoryContext rd_pdcxt;		/* private context for rd_partdesc, if any */
+
+	/* Same as above, for partdescs that omit detached partitions */
+	PartitionDesc rd_partdesc_nodetached;	/* partdesc w/o detached parts */
+	MemoryContext rd_pddcxt;	/* for rd_partdesc_nodetached, if any */
+
+	/*
+	 * pg_inherits.xmin of the partition that was excluded in
+	 * rd_partdesc_nodetached.  This informs a future user of that partdesc:
+	 * if this value is not in progress for the active snapshot, then the
+	 * partdesc can be used, otherwise they have to build a new one.  (This
+	 * matches what find_inheritance_children_extended would do).
+	 */
+	TransactionId rd_partdesc_nodetached_xmin;
+
+	/* data managed by RelationGetPartitionQual: */
+	List	   *rd_partcheck;	/* partition CHECK quals */
+	bool		rd_partcheckvalid;	/* true if list has been computed */
+	MemoryContext rd_partcheckcxt;	/* private cxt for rd_partcheck, if any */
+
+	/* data managed by RelationGetIndexList: */
+	List	   *rd_indexlist;	/* list of OIDs of indexes on relation */
+	Oid			rd_pkindex;		/* OID of primary key, if any */
+	Oid			rd_replidindex; /* OID of replica identity index, if any */
+
+	/* data managed by RelationGetStatExtList: */
+	List	   *rd_statlist;	/* list of OIDs of extended stats */
+
+	/* data managed by RelationGetIndexAttrBitmap: */
+	Bitmapset  *rd_indexattr;	/* identifies columns used in indexes */
+	Bitmapset  *rd_keyattr;		/* cols that can be ref'd by foreign keys */
+	Bitmapset  *rd_pkattr;		/* cols included in primary key */
+	Bitmapset  *rd_idattr;		/* included in replica identity index */
+
+	PublicationActions *rd_pubactions;	/* publication actions */
+
+	/*
+	 * 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 */
+
+	/*
+	 * Oid of the handler for this relation. For an index this is a function
+	 * returning IndexAmRoutine, for table like relations a function returning
+	 * TableAmRoutine.  This is stored separately from rd_indam, rd_tableam as
+	 * its lookup requires syscache access, but during relcache bootstrap we
+	 * need to be able to initialize rd_tableam without syscache lookups.
+	 */
+	Oid			rd_amhandler;	/* OID of index AM's handler function */
+
+	/*
+	 * Table access method.
+	 */
+	const struct TableAmRoutine *rd_tableam;
+
+	/* These are non-NULL only for an index relation: */
+	Form_pg_index rd_index;		/* pg_index tuple describing this index */
+	/* use "struct" here to avoid needing to include htup.h: */
+	struct HeapTupleData *rd_indextuple;	/* all of pg_index tuple */
+
+	/*
+	 * index access support info (used only for an index relation)
+	 *
+	 * Note: only default support procs for each opclass are cached, namely
+	 * those with lefttype and righttype equal to the opclass's opcintype. The
+	 * arrays are indexed by support function number, which is a sufficient
+	 * identifier given that restriction.
+	 */
+	MemoryContext rd_indexcxt;	/* private memory cxt for this stuff */
+	/* use "struct" here to avoid needing to include amapi.h: */
+	struct IndexAmRoutine *rd_indam;	/* index AM's API struct */
+	Oid		   *rd_opfamily;	/* OIDs of op families for each index col */
+	Oid		   *rd_opcintype;	/* OIDs of opclass declared input data types */
+	RegProcedure *rd_support;	/* OIDs of support procedures */
+	struct FmgrInfo *rd_supportinfo;	/* lookup info for support procedures */
+	int16	   *rd_indoption;	/* per-column AM-specific flags */
+	List	   *rd_indexprs;	/* index expression trees, if any */
+	List	   *rd_indpred;		/* index predicate tree, if any */
+	Oid		   *rd_exclops;		/* OIDs of exclusion operators, if any */
+	Oid		   *rd_exclprocs;	/* OIDs of exclusion ops' procs, if any */
+	uint16	   *rd_exclstrats;	/* exclusion ops' strategy numbers, if any */
+	Oid		   *rd_indcollation;	/* OIDs of index collations */
+	bytea	  **rd_opcoptions;	/* parsed opclass-specific options */
+
+	/*
+	 * rd_amcache is available for index and table AMs to cache private data
+	 * about the relation.  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 relation).  If used, it must point to a single memory
+	 * chunk palloc'd in CacheMemoryContext, or in rd_indexcxt for an index
+	 * relation.  A relcache reset will include freeing that chunk and setting
+	 * rd_amcache = NULL.
+	 */
+	void	   *rd_amcache;		/* available for use by index/table AM */
+
+	/*
+	 * foreign-table support
+	 *
+	 * rd_fdwroutine must point to a single memory chunk palloc'd in
+	 * CacheMemoryContext.  It will be freed and reset to NULL on a relcache
+	 * reset.
+	 */
+
+	/* use "struct" here to avoid needing to include fdwapi.h: */
+	struct FdwRoutine *rd_fdwroutine;	/* cached function pointers, or NULL */
+
+	/*
+	 * Hack for CLUSTER, rewriting ALTER TABLE, etc: when writing a new
+	 * version of a table, we need to make any toast pointers inserted into it
+	 * have the existing toast table's OID, not the OID of the transient toast
+	 * table.  If rd_toastoid isn't InvalidOid, it is the OID to place in
+	 * toast pointers inserted into this rel.  (Note it's set on the new
+	 * version of the main heap, not the toast table itself.)  This also
+	 * causes toast_save_datum() to try to preserve toast value OIDs.
+	 */
+	Oid			rd_toastoid;	/* Real TOAST table's OID, or InvalidOid */
+
+	/* use "struct" here to avoid needing to include pgstat.h: */
+	struct PgStat_TableStatus *pgstat_info; /* statistics collection area */
+} RelationData;
+
+
+/*
+ * ForeignKeyCacheInfo
+ *		Information the relcache can cache about foreign key constraints
+ *
+ * This is basically just an image of relevant columns from pg_constraint.
+ * We make it a subclass of Node so that copyObject() can be used on a list
+ * of these, but we also ensure it is a "flat" object without substructure,
+ * so that list_free_deep() is sufficient to free such a list.
+ * The per-FK-column arrays can be fixed-size because we allow at most
+ * INDEX_MAX_KEYS columns in a foreign key constraint.
+ *
+ * Currently, we mostly cache fields of interest to the planner, but the set
+ * of fields has already grown the constraint OID for other uses.
+ */
+typedef struct ForeignKeyCacheInfo
+{
+	NodeTag		type;
+	Oid			conoid;			/* oid of the constraint itself */
+	Oid			conrelid;		/* relation constrained by the foreign key */
+	Oid			confrelid;		/* relation referenced by the foreign key */
+	int			nkeys;			/* number of columns in the foreign key */
+	/* these arrays each have nkeys valid entries: */
+	AttrNumber	conkey[INDEX_MAX_KEYS]; /* cols in referencing table */
+	AttrNumber	confkey[INDEX_MAX_KEYS];	/* cols in referenced table */
+	Oid			conpfeqop[INDEX_MAX_KEYS];	/* PK = FK operator OIDs */
+} ForeignKeyCacheInfo;
+
+
+/*
+ * StdRdOptions
+ *		Standard contents of rd_options for heaps.
+ *
+ * RelationGetFillFactor() and RelationGetTargetPageFreeSpace() can only
+ * be applied to relations that use this format or a superset for
+ * private options data.
+ */
+ /* autovacuum-related reloptions. */
+typedef struct AutoVacOpts
+{
+	bool		enabled;
+	int			vacuum_threshold;
+	int			vacuum_ins_threshold;
+	int			analyze_threshold;
+	int			vacuum_cost_limit;
+	int			freeze_min_age;
+	int			freeze_max_age;
+	int			freeze_table_age;
+	int			multixact_freeze_min_age;
+	int			multixact_freeze_max_age;
+	int			multixact_freeze_table_age;
+	int			log_min_duration;
+	float8		vacuum_cost_delay;
+	float8		vacuum_scale_factor;
+	float8		vacuum_ins_scale_factor;
+	float8		analyze_scale_factor;
+} AutoVacOpts;
+
+/* StdRdOptions->vacuum_index_cleanup values */
+typedef enum StdRdOptIndexCleanup
+{
+	STDRD_OPTION_VACUUM_INDEX_CLEANUP_AUTO = 0,
+	STDRD_OPTION_VACUUM_INDEX_CLEANUP_OFF,
+	STDRD_OPTION_VACUUM_INDEX_CLEANUP_ON
+} StdRdOptIndexCleanup;
+
+typedef struct StdRdOptions
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	int			fillfactor;		/* page fill factor in percent (0..100) */
+	int			toast_tuple_target; /* target for tuple toasting */
+	AutoVacOpts autovacuum;		/* autovacuum-related options */
+	bool		user_catalog_table; /* use as an additional catalog relation */
+	int			parallel_workers;	/* max number of parallel workers */
+	StdRdOptIndexCleanup vacuum_index_cleanup;	/* controls index vacuuming */
+	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+} StdRdOptions;
+
+#define HEAP_MIN_FILLFACTOR			10
+#define HEAP_DEFAULT_FILLFACTOR		100
+
+/*
+ * RelationGetToastTupleTarget
+ *		Returns the relation's toast_tuple_target.  Note multiple eval of argument!
+ */
+#define RelationGetToastTupleTarget(relation, defaulttarg) \
+	((relation)->rd_options ? \
+	 ((StdRdOptions *) (relation)->rd_options)->toast_tuple_target : (defaulttarg))
+
+/*
+ * 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)
+
+/*
+ * RelationIsUsedAsCatalogTable
+ *		Returns whether the relation should be treated as a catalog table
+ *		from the pov of logical decoding.  Note multiple eval of argument!
+ */
+#define RelationIsUsedAsCatalogTable(relation)	\
+	((relation)->rd_options && \
+	 ((relation)->rd_rel->relkind == RELKIND_RELATION || \
+	  (relation)->rd_rel->relkind == RELKIND_MATVIEW) ? \
+	 ((StdRdOptions *) (relation)->rd_options)->user_catalog_table : false)
+
+/*
+ * RelationGetParallelWorkers
+ *		Returns the relation's parallel_workers reloption setting.
+ *		Note multiple eval of argument!
+ */
+#define RelationGetParallelWorkers(relation, defaultpw) \
+	((relation)->rd_options ? \
+	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
+
+/* ViewOptions->check_option values */
+typedef enum ViewOptCheckOption
+{
+	VIEW_OPTION_CHECK_OPTION_NOT_SET,
+	VIEW_OPTION_CHECK_OPTION_LOCAL,
+	VIEW_OPTION_CHECK_OPTION_CASCADED
+} ViewOptCheckOption;
+
+/*
+ * ViewOptions
+ *		Contents of rd_options for views
+ */
+typedef struct ViewOptions
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	bool		security_barrier;
+	ViewOptCheckOption check_option;
+} ViewOptions;
+
+/*
+ * RelationIsSecurityView
+ *		Returns whether the relation is security view, or not.  Note multiple
+ *		eval of argument!
+ */
+#define RelationIsSecurityView(relation)									\
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_VIEW),				\
+	 (relation)->rd_options ?												\
+	  ((ViewOptions *) (relation)->rd_options)->security_barrier : false)
+
+/*
+ * RelationHasCheckOption
+ *		Returns true if the relation is a view defined with either the local
+ *		or the cascaded check option.  Note multiple eval of argument!
+ */
+#define RelationHasCheckOption(relation)									\
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_VIEW),				\
+	 (relation)->rd_options &&												\
+	 ((ViewOptions *) (relation)->rd_options)->check_option !=				\
+	 VIEW_OPTION_CHECK_OPTION_NOT_SET)
+
+/*
+ * RelationHasLocalCheckOption
+ *		Returns true if the relation is a view defined with the local check
+ *		option.  Note multiple eval of argument!
+ */
+#define RelationHasLocalCheckOption(relation)								\
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_VIEW),				\
+	 (relation)->rd_options &&												\
+	 ((ViewOptions *) (relation)->rd_options)->check_option ==				\
+	 VIEW_OPTION_CHECK_OPTION_LOCAL)
+
+/*
+ * RelationHasCascadedCheckOption
+ *		Returns true if the relation is a view defined with the cascaded check
+ *		option.  Note multiple eval of argument!
+ */
+#define RelationHasCascadedCheckOption(relation)							\
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_VIEW),				\
+	 (relation)->rd_options &&												\
+	 ((ViewOptions *) (relation)->rd_options)->check_option ==				\
+	  VIEW_OPTION_CHECK_OPTION_CASCADED)
+
+/*
+ * RelationIsValid
+ *		True iff relation descriptor is valid.
+ */
+#define RelationIsValid(relation) PointerIsValid(relation)
+
+#define InvalidRelation ((Relation) NULL)
+
+/*
+ * RelationHasReferenceCountZero
+ *		True iff relation reference count is zero.
+ *
+ * Note:
+ *		Assumes relation descriptor is valid.
+ */
+#define RelationHasReferenceCountZero(relation) \
+		((bool)((relation)->rd_refcnt == 0))
+
+/*
+ * RelationGetForm
+ *		Returns pg_class tuple for a relation.
+ *
+ * Note:
+ *		Assumes relation descriptor is valid.
+ */
+#define RelationGetForm(relation) ((relation)->rd_rel)
+
+/*
+ * RelationGetRelid
+ *		Returns the OID of the relation
+ */
+#define RelationGetRelid(relation) ((relation)->rd_id)
+
+/*
+ * RelationGetNumberOfAttributes
+ *		Returns the total number of attributes in a relation.
+ */
+#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
+
+/*
+ * IndexRelationGetNumberOfAttributes
+ *		Returns the number of attributes in an index.
+ */
+#define IndexRelationGetNumberOfAttributes(relation) \
+		((relation)->rd_index->indnatts)
+
+/*
+ * IndexRelationGetNumberOfKeyAttributes
+ *		Returns the number of key attributes in an index.
+ */
+#define IndexRelationGetNumberOfKeyAttributes(relation) \
+		((relation)->rd_index->indnkeyatts)
+
+/*
+ * RelationGetDescr
+ *		Returns tuple descriptor for a relation.
+ */
+#define RelationGetDescr(relation) ((relation)->rd_att)
+
+/*
+ * RelationGetRelationName
+ *		Returns the rel's name.
+ *
+ * Note that the name is only unique within the containing namespace.
+ */
+#define RelationGetRelationName(relation) \
+	(NameStr((relation)->rd_rel->relname))
+
+/*
+ * RelationGetNamespace
+ *		Returns the rel's namespace OID.
+ */
+#define RelationGetNamespace(relation) \
+	((relation)->rd_rel->relnamespace)
+
+/*
+ * RelationIsMapped
+ *		True if the relation uses the relfilenode map.  Note multiple eval
+ *		of argument!
+ */
+#define RelationIsMapped(relation) \
+	(RELKIND_HAS_STORAGE((relation)->rd_rel->relkind) && \
+	 ((relation)->rd_rel->relfilenode == InvalidOid))
+
+/*
+ * RelationOpenSmgr
+ *		Open the relation at the smgr level, if not already done.
+ */
+#define RelationOpenSmgr(relation) \
+	do { \
+		if ((relation)->rd_smgr == NULL) \
+			smgrsetowner(&((relation)->rd_smgr), smgropen((relation)->rd_node, (relation)->rd_backend)); \
+	} while (0)
+
+/*
+ * RelationCloseSmgr
+ *		Close the relation at the smgr level, if not already done.
+ *
+ * Note: smgrclose should unhook from owner pointer, hence the Assert.
+ */
+#define RelationCloseSmgr(relation) \
+	do { \
+		if ((relation)->rd_smgr != NULL) \
+		{ \
+			smgrclose((relation)->rd_smgr); \
+			Assert((relation)->rd_smgr == NULL); \
+		} \
+	} while (0)
+
+/*
+ * RelationGetTargetBlock
+ *		Fetch relation's current insertion target block.
+ *
+ * Returns InvalidBlockNumber if there is no current target block.  Note
+ * that the target block status is discarded on any smgr-level invalidation.
+ */
+#define RelationGetTargetBlock(relation) \
+	( (relation)->rd_smgr != NULL ? (relation)->rd_smgr->smgr_targblock : InvalidBlockNumber )
+
+/*
+ * RelationSetTargetBlock
+ *		Set relation's current insertion target block.
+ */
+#define RelationSetTargetBlock(relation, targblock) \
+	do { \
+		RelationOpenSmgr(relation); \
+		(relation)->rd_smgr->smgr_targblock = (targblock); \
+	} while (0)
+
+/*
+ * RelationIsPermanent
+ *		True if relation is permanent.
+ */
+#define RelationIsPermanent(relation) \
+	((relation)->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT)
+
+/*
+ * RelationNeedsWAL
+ *		True if relation needs WAL.
+ *
+ * Returns false if wal_level = minimal and this relation is created or
+ * truncated in the current transaction.  See "Skipping WAL for New
+ * RelFileNode" in src/backend/access/transam/README.
+ */
+#define RelationNeedsWAL(relation)										\
+	(RelationIsPermanent(relation) && (XLogIsNeeded() ||				\
+	  (relation->rd_createSubid == InvalidSubTransactionId &&			\
+	   relation->rd_firstRelfilenodeSubid == InvalidSubTransactionId)))
+
+/*
+ * RelationUsesLocalBuffers
+ *		True if relation's pages are stored in local buffers.
+ */
+#define RelationUsesLocalBuffers(relation) \
+	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+
+/*
+ * RELATION_IS_LOCAL
+ *		If a rel is either temp or newly created in the current transaction,
+ *		it can be assumed to be accessible only to the current backend.
+ *		This is typically used to decide that we can skip acquiring locks.
+ *
+ * Beware of multiple eval of argument
+ */
+#define RELATION_IS_LOCAL(relation) \
+	((relation)->rd_islocaltemp || \
+	 (relation)->rd_createSubid != InvalidSubTransactionId)
+
+/*
+ * RELATION_IS_OTHER_TEMP
+ *		Test for a temporary relation that belongs to some other session.
+ *
+ * Beware of multiple eval of argument
+ */
+#define RELATION_IS_OTHER_TEMP(relation) \
+	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP && \
+	 !(relation)->rd_islocaltemp)
+
+
+/*
+ * RelationIsScannable
+ *		Currently can only be false for a materialized view which has not been
+ *		populated by its query.  This is likely to get more complicated later,
+ *		so use a macro which looks like a function.
+ */
+#define RelationIsScannable(relation) ((relation)->rd_rel->relispopulated)
+
+/*
+ * RelationIsPopulated
+ *		Currently, we don't physically distinguish the "populated" and
+ *		"scannable" properties of matviews, but that may change later.
+ *		Hence, use the appropriate one of these macros in code tests.
+ */
+#define RelationIsPopulated(relation) ((relation)->rd_rel->relispopulated)
+
+/*
+ * RelationIsAccessibleInLogicalDecoding
+ *		True if we need to log enough information to have access via
+ *		decoding snapshot.
+ */
+#define RelationIsAccessibleInLogicalDecoding(relation) \
+	(XLogLogicalInfoActive() && \
+	 RelationNeedsWAL(relation) && \
+	 (IsCatalogRelation(relation) || RelationIsUsedAsCatalogTable(relation)))
+
+/*
+ * RelationIsLogicallyLogged
+ *		True if we need to log enough information to extract the data from the
+ *		WAL stream.
+ *
+ * We don't log information for unlogged tables (since they don't WAL log
+ * anyway), for foreign tables (since they don't WAL log, either),
+ * and for system tables (their content is hard to make sense of, and
+ * it would complicate decoding slightly for little gain). Note that we *do*
+ * log information for user defined catalog tables since they presumably are
+ * interesting to the user...
+ */
+#define RelationIsLogicallyLogged(relation) \
+	(XLogLogicalInfoActive() && \
+	 RelationNeedsWAL(relation) && \
+	 (relation)->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&	\
+	 !IsCatalogRelation(relation))
+
+/* routines in utils/cache/relcache.c */
+extern void RelationIncrementReferenceCount(Relation rel);
+extern void RelationDecrementReferenceCount(Relation rel);
+
+#endif							/* REL_H */