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src/sql/engine/expr/ob_expr_instr.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 SRC_SQL_ENGINE_EXPR_OB_EXPR_INSTR_H_
#define SRC_SQL_ENGINE_EXPR_OB_EXPR_INSTR_H_
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObExprInstr : public ObLocationExprOperator {
public:
ObExprInstr();
explicit ObExprInstr(common::ObIAllocator& alloc);
virtual ~ObExprInstr();
virtual int calc_result2(
common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const;
virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
static int calc_mysql_instr_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprInstr);
};
class ObExprOracleInstr : public ObLocationExprOperator {
public:
ObExprOracleInstr();
explicit ObExprOracleInstr(common::ObIAllocator& alloc);
virtual ~ObExprOracleInstr();
virtual int calc_result_typeN(
ObExprResType& type, ObExprResType* type_array, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_resultN(
common::ObObj& result, const common::ObObj* param_array, int64_t param_num, common::ObExprCtx& expr_ctx) const;
static int slow_reverse_search(common::ObIAllocator& alloc, const common::ObCollationType& cs_type,
const common::ObString& str1, const common::ObString& str2, int64_t neg_start, int64_t occ, uint32_t& idx);
virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
static int calc_oracle_instr_arg(const ObExpr& expr, ObEvalCtx& ctx, bool& is_null, common::ObDatum*& haystack,
common::ObDatum*& needle, int64_t& pos_int, int64_t& occ_int, common::ObCollationType& calc_cs_type);
static int calc_oracle_instr_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);
static int calc(common::ObObj& result, const common::ObObj& heystack, const common::ObObj& needle,
const common::ObObj& position, const common::ObObj& occurrence, common::ObExprCtx& expr_ctx);
private:
virtual int calc_result_type2(
ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const;
DISALLOW_COPY_AND_ASSIGN(ObExprOracleInstr);
};
} // end of namespace sql
} // end of namespace oceanbase
#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_INSTR_H_ */