text: /*****************************************************************************
  
  Copyright (c) 1996, 2018, Oracle and/or its affiliates. All Rights Reserved.
  
  This program is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License, version 2.0, as published by the
  Free Software Foundation.
  
  This program is also distributed with certain software (including but not
  limited to OpenSSL) that is licensed under separate terms, as designated in a
  particular file or component or in included license documentation. The authors
  of MySQL hereby grant you an additional permission to link the program and
  your derivative works with the separately licensed software that they have
  included with MySQL.
  
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  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
  for more details.
  
  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  
  *****************************************************************************/
  
  /** @file include/btr0types.h
   The index tree general types
  
   Created 2/17/1996 Heikki Tuuri
   *************************************************************************/
  
  #ifndef btr0types_h
  #define btr0types_h
  
  #include "univ.i"
  
  #include "page0size.h"
  #include "page0types.h"
  #include "rem0types.h"
  #include "sync0rw.h"
  
  /** Persistent cursor */
  struct btr_pcur_t;
  /** B-tree cursor */
  struct btr_cur_t;
  /** B-tree search information for the adaptive hash index */
  struct btr_search_t;
  
  /** Is search system enabled.
  Search system is protected by array of latches. */
  extern bool btr_search_enabled;
  
  /** Number of adaptive hash index partition. */
  extern ulong btr_ahi_parts;
  
  /** The size of a reference to data stored on a different page.
  The reference is stored at the end of the prefix of the field
  in the index record. */
  #define BTR_EXTERN_FIELD_REF_SIZE FIELD_REF_SIZE
  
  /** If the data don't exceed the size, the data are stored locally. */
  #define BTR_EXTERN_LOCAL_STORED_MAX_SIZE (BTR_EXTERN_FIELD_REF_SIZE * 2)
  
  #endif
  