pg_shdepend.h

Go to the documentation of this file.

/*-------------------------------------------------------------------------
 *
 * pg_shdepend.h
 *    definition of the "shared dependency" system catalog (pg_shdepend)
 *
 * pg_shdepend has no preloaded contents, so there is no pg_shdepend.dat
 * file; dependencies for system-defined objects are loaded into it
 * on-the-fly during initdb.  Most built-in objects are pinned anyway,
 * and hence need no explicit entries in pg_shdepend.
 *
 * NOTE: we do not represent all possible dependency pairs in pg_shdepend;
 * for example, there's not much value in creating an explicit dependency
 * from a relation to its database.  Currently, only dependencies on roles
 * are explicitly stored in pg_shdepend.
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_shdepend.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_SHDEPEND_H
#define PG_SHDEPEND_H
 
#include "catalog/genbki.h"
#include "catalog/pg_shdepend_d.h"  /* IWYU pragma: export */
 
/* ----------------
 *      pg_shdepend definition.  cpp turns this into
 *      typedef struct FormData_pg_shdepend
 * ----------------
 */
CATALOG(pg_shdepend,1214,SharedDependRelationId) BKI_SHARED_RELATION
{
    /*
     * Identification of the dependent (referencing) object.
     *
     * Note that dbid can be zero to denote a shared object.
     */
    Oid         dbid BKI_LOOKUP_OPT(pg_database);   /* OID of database
                                                     * containing object */
    Oid         classid BKI_LOOKUP(pg_class);   /* OID of table containing
                                                 * object */
    Oid         objid;          /* OID of object itself */
    int32       objsubid;       /* column number, or 0 if not used */
 
    /*
     * Identification of the independent (referenced) object.  This is always
     * a shared object, so we need no database ID field.  We don't bother with
     * a sub-object ID either.
     */
    Oid         refclassid BKI_LOOKUP(pg_class);    /* OID of table containing
                                                     * object */
    Oid         refobjid;       /* OID of object itself */
 
    /*
     * Precise semantics of the relationship are specified by the deptype
     * field.  See SharedDependencyType in catalog/dependency.h.
     */
    char        deptype;        /* see codes in dependency.h */
} FormData_pg_shdepend;
 
/* ----------------
 *      Form_pg_shdepend corresponds to a pointer to a row with
 *      the format of pg_shdepend relation.
 * ----------------
 */
typedef FormData_pg_shdepend *Form_pg_shdepend;
 
DECLARE_INDEX(pg_shdepend_depender_index, 1232, SharedDependDependerIndexId, pg_shdepend, btree(dbid oid_ops, classid oid_ops, objid oid_ops, objsubid int4_ops));
DECLARE_INDEX(pg_shdepend_reference_index, 1233, SharedDependReferenceIndexId, pg_shdepend, btree(refclassid oid_ops, refobjid oid_ops));
 
#endif                          /* PG_SHDEPEND_H */