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src/sql/engine/expr/ob_expr_mid.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_MID_
+#define OCEANBASE_SQL_ENGINE_EXPR_MID_
+
+#include "sql/engine/expr/ob_expr_substr.h"
+
+namespace oceanbase {
+namespace sql {
+
+class ObExprMid : public ObExprSubstr {
+  public:
+  explicit ObExprMid(common::ObIAllocator& alloc) : ObExprSubstr(alloc)
+  {
+    *(const_cast<ObExprOperatorType*>(&type_)) = T_FUN_SYS_MID;
+    *(const_cast<const char**>(&name_)) = N_MID;
+  };
+  virtual ~ObExprMid(){};
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprMid);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif