55 lines
2.2 KiB
C++
55 lines
2.2 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_EXPR_OB_EXPR_ORACLE_NULLIF_
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#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ORACLE_NULLIF_
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#include "sql/engine/expr/ob_expr_nullif.h"
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using namespace oceanbase::common;
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namespace oceanbase {
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namespace sql {
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class ObExprOracleNullif : public ObExprNullif
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{
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public:
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explicit ObExprOracleNullif(common::ObIAllocator &alloc);
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virtual ~ObExprOracleNullif(){};
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virtual int calc_result_type2(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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common::ObExprTypeCtx &type_ctx) const;
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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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static int eval_nullif(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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static int eval_nullif_not_null(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprOracleNullif);
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bool is_same_type(const ObExprResType &type1, const ObExprResType &type2) const;
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bool is_numberic_type(const ObObjOType &otype1, const ObObjOType &otype2) const;
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// type1与type2都是oracle的数值类型（smallint，int，float，number，binary_float，binary_double)
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void calc_numberic_type(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2) const;
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bool is_string_type(const ObObjOType &otype1, const ObObjOType &otype2) const;
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bool is_time_type(const ObObjOType &otype1, const ObObjOType &otype2) const;
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};
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} // namespace sql
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} // namespace oceanbase
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#endif // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ORACLE_NULLIF_
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