[FEAT MERGE] OB Support XMLType

Co-authored-by: simonjoylet <simonjoylet@gmail.com>

src/sql/engine/expr/ob_expr_update_xml.h

@@ -0,0 +1,47 @@
+/**
+ * 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.
+ * This file is for func updatexml.
+ */
+
+#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_UPDATE_XML_H
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_UPDATE_XML_H
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase
+{
+
+namespace sql
+{
+
+class ObExprUpdateXml : public ObFuncExprOperator
+{
+public:
+  explicit ObExprUpdateXml(common::ObIAllocator &alloc);
+  virtual ~ObExprUpdateXml();
+  virtual int calc_result_typeN(ObExprResType &type,
+                                ObExprResType *types,
+                                int64_t param_num,
+                                common::ObExprTypeCtx &type_ctx) const override;
+  static int eval_update_xml(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res) { return OB_NOT_SUPPORTED; }
+  virtual int cg_expr(ObExprCGCtx &expr_cg_ctx,
+                      const ObRawExpr &raw_expr,
+                      ObExpr &rt_expr)
+                      const override;
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprUpdateXml);
+};
+
+} // sql
+} // oceanbase
+
+
+#endif // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_UPDATE_XML_H