95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef Oceanbase_SQL_OPTIMIZER_DEFAULT_STAT_H_
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#define Oceanbase_SQL_OPTIMIZER_DEFAULT_STAT_H_
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namespace oceanbase
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{
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namespace common
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{
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const double LN_2 = 0.69314718055994530941723212145818;
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#define LOGN(x) (log(x))
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#define LOG2(x) (LOGN(static_cast<double>(x)) / LN_2)
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const double DEFAULT_CACHE_HIT_RATE = 0.8;
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const double VIRTUAL_INDEX_GET_COST = 20;
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const int64_t DEFAULT_ROW_SIZE = 200;
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const int64_t DEFAULT_COLUMN_SIZE = 10;
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const int64_t DEFAULT_MICRO_BLOCK_SIZE = 16L * 1024;
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const int64_t DEFAULT_MACRO_BLOCK_SIZE_MB = 2L;
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const int64_t DEFAULT_MACRO_BLOCK_SIZE = DEFAULT_MACRO_BLOCK_SIZE_MB * 1024 * 1024;
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const int64_t OB_EST_DEFAULT_VIRTUAL_TABLE_ROW_COUNT = 100000;
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const double EST_DEF_COL_NULL_RATIO = 0.01;
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const double EST_DEF_COL_NOT_NULL_RATIO = 1 - EST_DEF_COL_NULL_RATIO;
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const double EST_DEF_VAR_EQ_SEL = EST_DEF_COL_NOT_NULL_RATIO;
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const int64_t OB_EST_DEFAULT_DATA_SIZE = DEFAULT_ROW_SIZE;
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const double OB_DEFAULT_HALF_OPEN_RANGE_SEL = 0.1;
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const double OB_DEFAULT_CLOSED_RANGE_SEL = 0.05;
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/**
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*@brief 等值表达式如("A = b")的默认选择率
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*/
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const double DEFAULT_EQ_SEL = 0.005;
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/**
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*@brief 非等值表达式(如"A < b")的默认选择率
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*/
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const double DEFAULT_INEQ_SEL = 1.0 / 3.0;
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/**
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*@brief 猜都没办法猜的默认选择率：一半一半
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*/
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const double DEFAULT_SEL = 0.5;
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///Update一行数据的代价.暂时写的
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const int64_t UPDATE_ONE_ROW_COST = 1;
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///DELETE一行数据的代价.暂时写的
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const int64_t DELETE_ONE_ROW_COST = 1;
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// [agg(expr) <|>|btw cosnt]的默认选择率，参考oracle
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const double DEFAULT_AGG_RANGE = 0.05;
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// [aggr(expr) = const]的默认选择率，参考oracle
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const double DEFAULT_AGG_EQ = 0.01;
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// clob/blob like "xxx" 的默认选择率
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const double DEFAULT_CLOB_LIKE_SEL = 0.05;
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const double DEFAULT_ANTI_JOIN_SEL = 0.01;
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enum ObEstimateType
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{
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OB_DEFAULT_STAT_EST,
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OB_CURRENT_STAT_EST,
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};
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} // namespace common
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} // namespace oceanabse
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#endif /* Oceanbase_SQL_OPTIMIZER_DEFAULT_STAT_H_ */
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