/**

* 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_CHR_

#define OCEANBASE_SQL_ENGINE_EXPR_CHR_

#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase

{

namespace sql

{

class ObExprChr : public ObStringExprOperator

{

public:

explicit ObExprChr(common::ObIAllocator &alloc);

virtual ~ObExprChr();

virtual int calc_result_type1(ObExprResType &type,

ObExprResType &text,

common::ObExprTypeCtx &type_ctx) const;

virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,

ObExpr &rt_expr) const;

static int number2varchar(common::ObString &str_result,

const double text,

common::ObIAllocator &alloc);

static int calc_chr_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum);

private:

DISALLOW_COPY_AND_ASSIGN(ObExprChr);

};

} //end namespace sql

} //end namespace oceanbase

#endif /* OCEANBASE_SQL_ENGINE_EXPR_CHR_ */