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85 lines
1.7 KiB
C++
85 lines
1.7 KiB
C++
/* Copyright (C) 2020 MariaDB Corporation
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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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
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifndef UTILS_COLWIDTH_H
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#define UTILS_COLWIDTH_H
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#include "branchpred.h"
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namespace utils
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{
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const uint8_t MAXLEGACYWIDTH = 8ULL;
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const uint8_t MAXCOLUMNWIDTH = 16ULL;
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inline bool isWide(uint8_t width)
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{
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return width > MAXLEGACYWIDTH;
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}
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inline bool isNarrow(uint8_t width)
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{
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return width <= MAXLEGACYWIDTH;
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}
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/** @brief Map a DECIMAL precision to data width in bytes */
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inline uint8_t widthByPrecision(unsigned p)
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{
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if (LIKELY(p > 18 && p < 39))
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return 16;
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switch (p)
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{
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case 1:
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case 2: return 1;
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case 3:
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case 4: return 2;
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case 5:
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case 6:
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case 7:
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case 8:
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case 9: return 4;
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case 10:
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case 11:
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case 12:
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case 13:
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case 14:
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case 15:
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case 16:
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case 17:
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case 18: return 8;
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default: return 16;
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}
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}
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inline uint8_t precisionByWidth(unsigned w)
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{
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switch (w)
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{
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case 16: return 38;
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// In case we will support decimals that spans 32 bytes.
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default: return 65;
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}
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}
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} // namespace utils
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#endif // UTILS_COLWIDTH_H
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