55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_SQL_ENGINE_OB_EXPR_FROM_BASE64_
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#define OCEANBASE_SQL_ENGINE_OB_EXPR_FROM_BASE64_
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#include "sql/engine/expr/ob_expr_operator.h"
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#include "share/object/ob_obj_cast.h"
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namespace oceanbase
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{
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namespace sql
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{
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class ObExprFromBase64 : public ObStringExprOperator {
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public:
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explicit ObExprFromBase64(common::ObIAllocator &alloc);
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virtual ~ObExprFromBase64();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &str,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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static int eval_from_base64(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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static int eval_from_base64_batch(const ObExpr &expr, ObEvalCtx &ctx,
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const ObBitVector &skip,
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const int64_t batch_size);
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprFromBase64);
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static int calc(common::ObObj &result,
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const common::ObObj &obj1,
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common::ObIAllocator *allocator);
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static const int64_t NCHAR_PER_BASE64 = 4;
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static const int64_t NCHAR_PER_BASE64_GROUP = 3;
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static inline ObLength base64_needed_decoded_length(ObLength length_of_encoded_data)
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{
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return (ObLength) ceil(length_of_encoded_data * NCHAR_PER_BASE64_GROUP / NCHAR_PER_BASE64);
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}
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};
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}
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}
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#endif //OCEANBASE_SQL_ENGINE_OB_EXPR_FROM_BASE64_
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