52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
/**
|
|
* 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_CONCAT_WS_H_
|
|
#define SRC_SQL_ENGINE_EXPR_OB_EXPR_CONCAT_WS_H_
|
|
#include "sql/engine/expr/ob_expr_operator.h"
|
|
namespace oceanbase
|
|
{
|
|
namespace sql
|
|
{
|
|
//stands for Concatenate With Separator and is a special form of CONCAT()
|
|
class ObExprConcatWs: public ObStringExprOperator
|
|
{
|
|
public:
|
|
ObExprConcatWs();
|
|
explicit ObExprConcatWs(common::ObIAllocator &alloc);
|
|
virtual ~ObExprConcatWs();
|
|
virtual int calc_result_typeN(ObExprResType &type,
|
|
ObExprResType *types,
|
|
int64_t param_num,
|
|
common::ObExprTypeCtx &type_ctx) const;
|
|
// connect two strings by separator
|
|
static int concat_ws(const common::ObString obj1,
|
|
const common::ObString obj2,
|
|
const int64_t buf_len,
|
|
char **string_buf,
|
|
int64_t &pos);
|
|
virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
|
|
ObExpr &rt_expr) const override;
|
|
static int calc_concat_ws_expr(const ObExpr &expr, ObEvalCtx &ctx,
|
|
ObDatum &res);
|
|
static int calc(const common::ObString &sep_str, const common::ObIArray<common::ObString> &words,
|
|
common::ObIAllocator &alloc, common::ObString &res_str);
|
|
private:
|
|
// disallow copy
|
|
DISALLOW_COPY_AND_ASSIGN(ObExprConcatWs);
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_CONCAT_WS_H_ */
|