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src/sql/engine/expr/ob_expr_mul.h Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#ifndef _OB_EXPR_MUL_H_
#define _OB_EXPR_MUL_H_
#include <cmath>
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObExprMul : public ObArithExprOperator {
public:
ObExprMul();
explicit ObExprMul(common::ObIAllocator& alloc, ObExprOperatorType type = T_OP_MUL);
virtual ~ObExprMul(){};
virtual int calc_result_type2(
ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_result2(
common::ObObj& result, const common::ObObj& left, const common::ObObj& right, common::ObExprCtx& expr_ctx) const;
static int calc(common::ObObj& res, const common::ObObj& ojb1, const common::ObObj& obj2,
common::ObIAllocator* allocator, common::ObScale scale);
static int calc(common::ObObj& res, const common::ObObj& ojb1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx,
common::ObScale scale);
static int mul_int_int(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_int_uint(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_uint_int(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_uint_uint(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_float(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_double(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_number(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int mul_intervalym_number_common(
const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, const bool number_left);
static int mul_intervalds_number_common(
const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, const bool number_left);
OB_INLINE static int mul_intervalym_number(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
return mul_intervalym_number_common(expr, ctx, expr_datum, false);
}
OB_INLINE static int mul_intervalds_number(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
return mul_intervalds_number_common(expr, ctx, expr_datum, false);
}
OB_INLINE static int mul_number_intervalym(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
return mul_intervalym_number_common(expr, ctx, expr_datum, true);
}
OB_INLINE static int mul_number_intervalds(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
return mul_intervalds_number_common(expr, ctx, expr_datum, true);
}
// temporary used, remove after all expr converted
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int mul_int(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_uint(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_double(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_double_no_overflow(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_float(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_number(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
static int mul_interval(common::ObObj& res, const common::ObObj& left, const common::ObObj& right,
common::ObIAllocator* allocator, common::ObScale scale);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprMul);
public:
// very very effective implementation
// if false is returned, the result of multiplication will be stored in res
template <typename T1, typename T2, typename T3>
OB_INLINE static bool is_mul_out_of_range(T1 val1, T2 val2, T3& res)
{
return __builtin_mul_overflow(val1, val2, &res);
}
OB_INLINE static bool is_int_uint_mul_out_of_range(int64_t val1, uint64_t val2)
{
bool overflow = false;
if ((val1 < 0) && (0 != val2)) {
overflow = true;
} else {
overflow = is_uint_uint_mul_out_of_range(static_cast<uint64_t>(val1), val2);
}
return overflow;
}
OB_INLINE static bool is_uint_uint_mul_out_of_range(uint64_t val1, uint64_t val2)
{
int ret = false;
uint64_t tmp = val1;
if (val1 > val2) {
tmp = val1;
val1 = val2;
val2 = tmp;
}
if (val1 > UINT32_MAX) {
ret = true;
} else {
uint64_t c = val2 >> SHIFT_OFFSET;
uint64_t r = val1 * c;
if (r > UINT32_MAX)
ret = true;
}
return ret;
}
private:
static ObArithFunc mul_funcs_[common::ObMaxTC];
static ObArithFunc agg_mul_funcs_[common::ObMaxTC];
static const int64_t SHIFT_OFFSET = 32;
};
// Mul expr for aggregation, different with ObExprMul:
// No overflow check for double type.
class ObExprAggMul : public ObExprMul {
public:
explicit ObExprAggMul(common::ObIAllocator& alloc) : ObExprMul(alloc, T_OP_AGG_MUL)
{}
};
} // namespace sql
} // namespace oceanbase
#endif /* _OB_NAME_NUL_H_*/