pg_depend.h

Go to the documentation of this file.

/*-------------------------------------------------------------------------
 *
 * pg_depend.h
 *    definition of the "dependency" system catalog (pg_depend)
 *
 * pg_depend has no preloaded contents, so there is no pg_depend.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_depend.
 *
 * NOTE: we do not represent all possible dependency pairs in pg_depend;
 * for example, there's not much value in creating an explicit dependency
 * from an attribute to its relation.  Usually we make a dependency for
 * cases where the relationship is conditional rather than essential
 * (for example, not all triggers are dependent on constraints, but all
 * attributes are dependent on relations) or where the dependency is not
 * convenient to find from the contents of other catalogs.
 *
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_depend.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_DEPEND_H
#define PG_DEPEND_H
 
#include "catalog/genbki.h"
#include "catalog/pg_depend_d.h"    /* IWYU pragma: export */
 
/* ----------------
 *      pg_depend definition.  cpp turns this into
 *      typedef struct FormData_pg_depend
 * ----------------
 */
CATALOG(pg_depend,2608,DependRelationId)
{
    /*
     * Identification of the dependent (referencing) 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.
     */
    Oid         refclassid BKI_LOOKUP(pg_class);    /* OID of table containing
                                                     * object */
    Oid         refobjid;       /* OID of object itself */
    int32       refobjsubid;    /* column number, or 0 if not used */
 
    /*
     * Precise semantics of the relationship are specified by the deptype
     * field.  See DependencyType in catalog/dependency.h.
     */
    char        deptype;        /* see codes in dependency.h */
} FormData_pg_depend;
 
/* ----------------
 *      Form_pg_depend corresponds to a pointer to a row with
 *      the format of pg_depend relation.
 * ----------------
 */
typedef FormData_pg_depend *Form_pg_depend;
 
DECLARE_INDEX(pg_depend_depender_index, 2673, DependDependerIndexId, pg_depend, btree(classid oid_ops, objid oid_ops, objsubid int4_ops));
DECLARE_INDEX(pg_depend_reference_index, 2674, DependReferenceIndexId, pg_depend, btree(refclassid oid_ops, refobjid oid_ops, refobjsubid int4_ops));
 
#endif                          /* PG_DEPEND_H */