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[FEAT MERGE] [v4.2] add table generator and several random utility functions

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This commit is contained in:
raywill
2023-04-13 08:22:22 +00:00
committed by ob-robot
parent 94159e6675
commit 27488211d2
34 changed files with 1659 additions and 79 deletions
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9
src/sql/engine/expr/ob_expr_random.h
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@ -13,6 +13,7 @@
#ifndef OCEANBASE_SQL_OB_EXPR_FUNC_RANDOM_H_
#define OCEANBASE_SQL_OB_EXPR_FUNC_RANDOM_H_
#include <random>
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase
@ -27,12 +28,10 @@ class ObExprRandom: public ObFuncExprOperator
public:
ObExprRandomCtx();
virtual ~ObExprRandomCtx();
void set_seed(uint32_t seed);
void get_next_random(double &res);
void set_seed(uint64_t seed);
void get_next_random(int64_t &res);
private:
static const uint64_t max_value_;
uint64_t seed1_;
uint64_t seed2_;
std::mt19937_64 gen_;
};
public:
explicit ObExprRandom(common::ObIAllocator &alloc);