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src/sql/engine/expr/ob_expr_oracle_nullif.h

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+/**
+ * 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_OB_EXPR_ORACLE_NULLIF_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ORACLE_NULLIF_
+
+#include "sql/engine/expr/ob_expr_nullif.h"
+
+using namespace oceanbase::common;
+namespace oceanbase {
+namespace sql {
+class ObExprOracleNullif : public ObExprNullif {
+  public:
+  explicit ObExprOracleNullif(common::ObIAllocator& alloc);
+  virtual ~ObExprOracleNullif(){};
+
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int eval_nullif(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
+  static int eval_nullif_not_null(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprOracleNullif);
+
+  bool is_same_type(const ObExprResType& type1, const ObExprResType& type2) const;
+
+  bool is_numberic_type(const ObObjOType& otype1, const ObObjOType& otype2) const;
+
+  void calc_numberic_type(ObExprResType& type, ObExprResType& type1, ObExprResType& type2) const;
+
+  bool is_string_type(const ObObjOType& otype1, const ObObjOType& otype2) const;
+
+  bool is_time_type(const ObObjOType& otype1, const ObObjOType& otype2) const;
+};
+}  // namespace sql
+}  // namespace oceanbase
+#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_ORACLE_NULLIF_