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src/sql/engine/expr/ob_expr_timestamp_diff.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 _OCEANBASE_SQL_OB_EXPR_TIME_STMAP_DIFF_H_
#define _OCEANBASE_SQL_OB_EXPR_TIME_STMAP_DIFF_H_
#include "lib/ob_name_def.h"
#include "share/object/ob_obj_cast.h"
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObExprTimeStampDiff : public ObFuncExprOperator {
public:
explicit ObExprTimeStampDiff(common::ObIAllocator& alloc);
virtual ~ObExprTimeStampDiff();
virtual int calc_result_type3(ObExprResType& type, ObExprResType& unit, ObExprResType& left, ObExprResType& right,
common::ObExprTypeCtx& type_ctx) const;
virtual int calc_result3(common::ObObj& result, const common::ObObj& unit, const common::ObObj& left,
const common::ObObj& right, common::ObExprCtx& expr_ctx) const;
virtual common::ObCastMode get_cast_mode() const
{
return CM_NULL_ON_WARN;
}
static int eval_timestamp_diff(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
virtual int cg_expr(ObExprCGCtx& ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
private:
static int calc(int64_t& res, bool& is_null, int64_t unit_value, int64_t usec_left, int64_t usec_right,
const common::ObTimeZoneInfo* tz_info);
static int calc_month_diff(
const int64_t& left, const int64_t& right, const common::ObTimeZoneInfo* tz_info, int64_t& diff);
static int adjust_sub_one(const common::ObTime* p_min, const common::ObTime* p_max, int64_t& bias);
// disallow copy
DISALLOW_COPY_AND_ASSIGN(ObExprTimeStampDiff);
};
inline int ObExprTimeStampDiff::calc_result_type3(ObExprResType& type, ObExprResType& unit, ObExprResType& left,
ObExprResType& right, common::ObExprTypeCtx& type_ctx) const
{
UNUSED(type_ctx);
UNUSED(unit);
type.set_int();
type.set_scale(common::DEFAULT_SCALE_FOR_INTEGER);
type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
// set calc type
left.set_calc_type(common::ObTimestampType);
right.set_calc_type(common::ObTimestampType);
return common::OB_SUCCESS;
}
} // namespace sql
} // namespace oceanbase
#endif //_OCEANBASE_SQL_OB_EXPR_TIME_STMAP_DIFF_H_