50 lines
1.9 KiB
C++
50 lines
1.9 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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* This file contains implementation for json_length.
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*/
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#ifndef OCEANBASE_SQL_OB_EXPR_JSON_LENGTH_H_
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#define OCEANBASE_SQL_OB_EXPR_JSON_LENGTH_H_
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#include "sql/engine/expr/ob_expr_operator.h"
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#include "lib/json_type/ob_json_path.h"
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using namespace oceanbase::common;
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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 ObExprJsonLength : public ObFuncExprOperator
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{
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public:
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explicit ObExprJsonLength(common::ObIAllocator &alloc);
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virtual ~ObExprJsonLength();
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virtual int calc_result_typeN(ObExprResType& type,
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ObExprResType* types_stack,
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int64_t param_num,
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ObExprTypeCtx& type_ctx) const override;
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static int calc(ObEvalCtx &ctx, const ObDatum &data1, ObDatumMeta meta1, bool has_lob_header1,
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const ObDatum *data2, ObDatumMeta meta2, bool has_lob_header2,
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ObIAllocator *allocator, ObDatum &res,
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ObJsonPathCache* path_cache);
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static int eval_json_length(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const override;
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virtual bool need_rt_ctx() const override { return true; }
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprJsonLength);
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};
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} // sql
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} // oceanbase
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#endif // OCEANBASE_SQL_OB_EXPR_JSON_LENGTH_H_
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