MySQL
8.1.0
Source Code Documentation
opt_statistics.h
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#ifndef OPT_STATISTICS_INCLUDED
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#define OPT_STATISTICS_INCLUDED
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/*
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Copyright (c) 2014, 2023, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <sys/types.h>
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#include "
my_inttypes.h
"
// IWYU pragma: keep
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struct
TABLE
;
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typedef
float
rec_per_key_t
;
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class
KEY
;
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/**
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Guesstimate for "records per key" when index statistics is not available.
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@param table the table
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@param key the index
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@param used_keyparts the number of key part that should be included in the
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estimate
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@return estimated records per key value
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*/
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rec_per_key_t
guess_rec_per_key
(
const
TABLE
*
const
table
,
const
KEY
*
const
key
,
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uint used_keyparts);
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#endif
/* OPT_STATISTICS_INCLUDED */
KEY
Definition:
key.h:112
rec_per_key_t
float rec_per_key_t
Data type for records per key estimates that are stored in the KEY::rec_per_key_float[] array.
Definition:
key.h:95
my_inttypes.h
Some integer typedefs for easier portability.
binlog::service::iterators::tests::table
static PFS_engine_table_share_proxy table
Definition:
pfs.cc:60
guess_rec_per_key
rec_per_key_t guess_rec_per_key(const TABLE *const table, const KEY *const key, uint used_keyparts)
Guesstimate for "records per key" when index statistics is not available.
Definition:
opt_statistics.cc:60
rec_per_key_t
float rec_per_key_t
Definition:
opt_statistics.h:31
key
required string key
Definition:
replication_asynchronous_connection_failover.proto:59
TABLE
Definition:
table.h:1394
sql
opt_statistics.h
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