text: /*-------------------------------------------------------------------------
   *
   * pg_am.h
   *	  definition of the "access method" system catalog (pg_am)
   *
   *
   * Portions Copyright (c) 1996-2021, 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"
  
  /* ----------------
   *		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, on pg_am using btree(amname name_ops));
  #define AmNameIndexId  2651
  DECLARE_UNIQUE_INDEX(pg_am_oid_index, 2652, on pg_am using btree(oid oid_ops));
  #define AmOidIndexId  2652
  
  #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 */
  