pg_am.h

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/*-------------------------------------------------------------------------
 *
 * pg_am.h
 *    definition of the "access method" system catalog (pg_am)
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_am.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_AM_H
#define PG_AM_H
 
#include "catalog/genbki.h"
#include "catalog/pg_am_d.h"    /* IWYU pragma: export */
 
/* ----------------
 *      pg_am definition.  cpp turns this into
 *      typedef struct FormData_pg_am
 * ----------------
 */
CATALOG(pg_am,2601,AccessMethodRelationId)
{
    Oid         oid;            /* oid */
 
    /* access method name */
    NameData    amname;
 
    /* handler function */
    regproc     amhandler BKI_LOOKUP(pg_proc);
 
    /* see AMTYPE_xxx constants below */
    char        amtype;
} FormData_pg_am;
 
/* ----------------
 *      Form_pg_am corresponds to a pointer to a tuple with
 *      the format of pg_am relation.
 * ----------------
 */
typedef FormData_pg_am *Form_pg_am;
 
DECLARE_UNIQUE_INDEX(pg_am_name_index, 2651, AmNameIndexId, pg_am, btree(amname name_ops));
DECLARE_UNIQUE_INDEX_PKEY(pg_am_oid_index, 2652, AmOidIndexId, pg_am, btree(oid oid_ops));
 
MAKE_SYSCACHE(AMNAME, pg_am_name_index, 4);
MAKE_SYSCACHE(AMOID, pg_am_oid_index, 4);
 
#ifdef EXPOSE_TO_CLIENT_CODE
 
/*
 * Allowed values for amtype
 */
#define AMTYPE_INDEX                    'i' /* index access method */
#define AMTYPE_TABLE                    't' /* table access method */
 
#endif                          /* EXPOSE_TO_CLIENT_CODE */
 
#endif                          /* PG_AM_H */