namespace.h

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/*-------------------------------------------------------------------------
 *
 * namespace.h
 *    prototypes for functions in backend/catalog/namespace.c
 *
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/namespace.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef NAMESPACE_H
#define NAMESPACE_H
 
#include "nodes/primnodes.h"
#include "storage/lock.h"
 
 
/*
 *  This structure holds a list of possible functions or operators
 *  found by namespace lookup.  Each function/operator is identified
 *  by OID and by argument types; the list must be pruned by type
 *  resolution rules that are embodied in the parser, not here.
 *  See FuncnameGetCandidates's comments for more info.
 */
typedef struct _FuncCandidateList
{
    struct _FuncCandidateList *next;
    int         pathpos;        /* for internal use of namespace lookup */
    Oid         oid;            /* the function or operator's OID */
    int         nominalnargs;   /* either pronargs or length(proallargtypes) */
    int         nargs;          /* number of arg types returned */
    int         nvargs;         /* number of args to become variadic array */
    int         ndargs;         /* number of defaulted args */
    int        *argnumbers;     /* args' positional indexes, if named call */
    Oid         args[FLEXIBLE_ARRAY_MEMBER];    /* arg types */
}          *FuncCandidateList;
 
/*
 * Result of checkTempNamespaceStatus
 */
typedef enum TempNamespaceStatus
{
    TEMP_NAMESPACE_NOT_TEMP,    /* nonexistent, or non-temp namespace */
    TEMP_NAMESPACE_IDLE,        /* exists, belongs to no active session */
    TEMP_NAMESPACE_IN_USE,      /* belongs to some active session */
} TempNamespaceStatus;
 
/*
 *  Structure for xxxSearchPathMatcher functions
 *
 * The generation counter is private to namespace.c and shouldn't be touched
 * by other code.  It can be initialized to zero if necessary (that means
 * "not known equal to the current active path").
 */
typedef struct SearchPathMatcher
{
    List       *schemas;        /* OIDs of explicitly named schemas */
    bool        addCatalog;     /* implicitly prepend pg_catalog? */
    bool        addTemp;        /* implicitly prepend temp schema? */
    uint64      generation;     /* for quick detection of equality to active */
} SearchPathMatcher;
 
/*
 * Option flag bits for RangeVarGetRelidExtended().
 */
typedef enum RVROption
{
    RVR_MISSING_OK = 1 << 0,    /* don't error if relation doesn't exist */
    RVR_NOWAIT = 1 << 1,        /* error if relation cannot be locked */
    RVR_SKIP_LOCKED = 1 << 2,   /* skip if relation cannot be locked */
}           RVROption;
 
typedef void (*RangeVarGetRelidCallback) (const RangeVar *relation, Oid relId,
                                          Oid oldRelId, void *callback_arg);
 
#define RangeVarGetRelid(relation, lockmode, missing_ok) \
    RangeVarGetRelidExtended(relation, lockmode, \
                             (missing_ok) ? RVR_MISSING_OK : 0, NULL, NULL)
 
extern Oid  RangeVarGetRelidExtended(const RangeVar *relation,
                                     LOCKMODE lockmode, uint32 flags,
                                     RangeVarGetRelidCallback callback,
                                     void *callback_arg);
extern Oid  RangeVarGetCreationNamespace(const RangeVar *newRelation);
extern Oid  RangeVarGetAndCheckCreationNamespace(RangeVar *relation,
                                                 LOCKMODE lockmode,
                                                 Oid *existing_relation_id);
extern void RangeVarAdjustRelationPersistence(RangeVar *newRelation, Oid nspid);
extern Oid  RelnameGetRelid(const char *relname);
extern bool RelationIsVisible(Oid relid);
 
extern Oid  TypenameGetTypid(const char *typname);
extern Oid  TypenameGetTypidExtended(const char *typname, bool temp_ok);
extern bool TypeIsVisible(Oid typid);
 
extern FuncCandidateList FuncnameGetCandidates(List *names,
                                               int nargs, List *argnames,
                                               bool expand_variadic,
                                               bool expand_defaults,
                                               bool include_out_arguments,
                                               bool missing_ok);
extern bool FunctionIsVisible(Oid funcid);
 
extern Oid  OpernameGetOprid(List *names, Oid oprleft, Oid oprright);
extern FuncCandidateList OpernameGetCandidates(List *names, char oprkind,
                                               bool missing_schema_ok);
extern bool OperatorIsVisible(Oid oprid);
 
extern Oid  OpclassnameGetOpcid(Oid amid, const char *opcname);
extern bool OpclassIsVisible(Oid opcid);
 
extern Oid  OpfamilynameGetOpfid(Oid amid, const char *opfname);
extern bool OpfamilyIsVisible(Oid opfid);
 
extern Oid  CollationGetCollid(const char *collname);
extern bool CollationIsVisible(Oid collid);
 
extern Oid  ConversionGetConid(const char *conname);
extern bool ConversionIsVisible(Oid conid);
 
extern Oid  get_statistics_object_oid(List *names, bool missing_ok);
extern bool StatisticsObjIsVisible(Oid stxid);
 
extern Oid  get_ts_parser_oid(List *names, bool missing_ok);
extern bool TSParserIsVisible(Oid prsId);
 
extern Oid  get_ts_dict_oid(List *names, bool missing_ok);
extern bool TSDictionaryIsVisible(Oid dictId);
 
extern Oid  get_ts_template_oid(List *names, bool missing_ok);
extern bool TSTemplateIsVisible(Oid tmplId);
 
extern Oid  get_ts_config_oid(List *names, bool missing_ok);
extern bool TSConfigIsVisible(Oid cfgid);
 
extern void DeconstructQualifiedName(const List *names,
                                     char **nspname_p,
                                     char **objname_p);
extern Oid  LookupNamespaceNoError(const char *nspname);
extern Oid  LookupExplicitNamespace(const char *nspname, bool missing_ok);
extern Oid  get_namespace_oid(const char *nspname, bool missing_ok);
 
extern Oid  LookupCreationNamespace(const char *nspname);
extern void CheckSetNamespace(Oid oldNspOid, Oid nspOid);
extern Oid  QualifiedNameGetCreationNamespace(const List *names, char **objname_p);
extern RangeVar *makeRangeVarFromNameList(const List *names);
extern char *NameListToString(const List *names);
extern char *NameListToQuotedString(const List *names);
 
extern bool isTempNamespace(Oid namespaceId);
extern bool isTempToastNamespace(Oid namespaceId);
extern bool isTempOrTempToastNamespace(Oid namespaceId);
extern bool isAnyTempNamespace(Oid namespaceId);
extern bool isOtherTempNamespace(Oid namespaceId);
extern TempNamespaceStatus checkTempNamespaceStatus(Oid namespaceId);
extern int  GetTempNamespaceBackendId(Oid namespaceId);
extern Oid  GetTempToastNamespace(void);
extern void GetTempNamespaceState(Oid *tempNamespaceId,
                                  Oid *tempToastNamespaceId);
extern void SetTempNamespaceState(Oid tempNamespaceId,
                                  Oid tempToastNamespaceId);
extern void ResetTempTableNamespace(void);
 
extern SearchPathMatcher *GetSearchPathMatcher(MemoryContext context);
extern SearchPathMatcher *CopySearchPathMatcher(SearchPathMatcher *path);
extern bool SearchPathMatchesCurrentEnvironment(SearchPathMatcher *path);
 
extern Oid  get_collation_oid(List *collname, bool missing_ok);
extern Oid  get_conversion_oid(List *conname, bool missing_ok);
extern Oid  FindDefaultConversionProc(int32 for_encoding, int32 to_encoding);
 
 
/* initialization & transaction cleanup code */
extern void InitializeSearchPath(void);
extern void AtEOXact_Namespace(bool isCommit, bool parallel);
extern void AtEOSubXact_Namespace(bool isCommit, SubTransactionId mySubid,
                                  SubTransactionId parentSubid);
 
/* stuff for search_path GUC variable */
extern PGDLLIMPORT char *namespace_search_path;
 
extern List *fetch_search_path(bool includeImplicit);
extern int  fetch_search_path_array(Oid *sarray, int sarray_len);
 
#endif                          /* NAMESPACE_H */