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src/sql/engine/expr/ob_expr_replace.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_ENGINE_EXPR_OB_EXPR_REPLACE_
#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_REPLACE_
#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 ObExprReplace : public ObStringExprOperator {
public:
explicit ObExprReplace(common::ObIAllocator& alloc);
virtual ~ObExprReplace();
virtual int calc_result_typeN(
ObExprResType& type, ObExprResType* types_array, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
static int calc(common::ObObj& result, const common::ObObj& text, const common::ObObj& from, const common::ObObj& to,
common::ObExprStringBuf& string_buf);
virtual int calc_resultN(
common::ObObj& result, const common::ObObj* objs_array, int64_t param_num, common::ObExprCtx& expr_ctx) const;
///@brief call function calc(), implementation of ObExprOperator::calc_result2()
///
///@param [out] result result of REPLACE(str, str, str)
///@param [in] text input of str
///@param [in] text input of from which str
///@param [in] text input of to which str
///@param [in] allocator:ObExprStringBuf
///@return OB_SUCCESS success, others failure
virtual int calc_result3(common::ObObj& result, const common::ObObj& text, const common::ObObj& from,
const common::ObObj& to, common::ObExprCtx& expr_ctx) const;
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int eval_replace(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
private:
// disallow copy
DISALLOW_COPY_AND_ASSIGN(ObExprReplace);
// helper func
static int replace(common::ObString& result, const common::ObString& text, const common::ObString& from,
const common::ObString& to, common::ObExprStringBuf& string_buf);
};
} // namespace sql
} // namespace oceanbase
#endif // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_REPLACE_