41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
#ifndef OPT_STATISTICS_INCLUDED
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#define OPT_STATISTICS_INCLUDED
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/*
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Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#include "my_global.h" // uint
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struct TABLE;
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typedef float rec_per_key_t;
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typedef struct st_key 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 */
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