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/*****************************************************************************
Copyright (c) 1994, 2025, Oracle and/or its affiliates.
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 designed to work 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 either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful, but WITHOUT
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/rem0types.h
Record manager global types
Created 5/30/1994 Heikki Tuuri
*************************************************************************/
#ifndef rem0types_h
#define rem0types_h
#include "data0type.h"
#include "univ.i"
/* We define the physical record simply as an array of bytes */
typedef byte rec_t;
/* Maximum values for various fields (for non-blob tuples) */
constexpr uint32_t REC_MAX_N_FIELDS = 1024 - 1;
constexpr uint32_t REC_MAX_HEAP_NO = 2 * 8192 - 1;
constexpr uint32_t REC_MAX_N_OWNED = 16 - 1;
/* Maximum number of user defined fields/columns. The reserved columns
are the ones InnoDB adds internally: DB_ROW_ID, DB_TRX_ID, DB_ROLL_PTR.
We need "* 2" because mlog_parse_index() creates a dummy table object
possibly, with some of the system columns in it, and then adds the 3
system columns (again) using dict_table_add_system_columns(). The problem
is that mlog_parse_index() cannot recognize the system columns by
just having n_fields, n_uniq and the lengths of the columns. */
constexpr uint32_t REC_MAX_N_USER_FIELDS =
REC_MAX_N_FIELDS - DATA_N_SYS_COLS * 2;
/* REC_ANTELOPE_MAX_INDEX_COL_LEN is measured in bytes and is the maximum
indexed field length (or indexed prefix length) for indexes on tables of
ROW_FORMAT=REDUNDANT and ROW_FORMAT=COMPACT format.
Before we support UTF-8 encodings with mbmaxlen = 4, a UTF-8 character
may take at most 3 bytes. So the limit was set to 3*256, so that one
can create a column prefix index on 256 characters of a TEXT or VARCHAR
column also in the UTF-8 charset.
This constant MUST NOT BE CHANGED, or the compatibility of InnoDB data
files would be at risk! */
constexpr uint32_t REC_ANTELOPE_MAX_INDEX_COL_LEN = 768;
/** Maximum indexed field length for tables that have atomic BLOBs.
This (3072) is the maximum index row length allowed, so we cannot create index
prefix column longer than that. */
constexpr uint32_t REC_VERSION_56_MAX_INDEX_COL_LEN = 3072;
/** Innodb row types are a subset of the MySQL global enum row_type.
They are made into their own enum so that switch statements can account
for each of them. */
enum rec_format_enum {
REC_FORMAT_REDUNDANT = 0, /*!< REDUNDANT row format */
REC_FORMAT_COMPACT = 1, /*!< COMPACT row format */
REC_FORMAT_COMPRESSED = 2, /*!< COMPRESSED row format */
REC_FORMAT_DYNAMIC = 3 /*!< DYNAMIC row format */
};
typedef enum rec_format_enum rec_format_t;
#endif
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