patch 4.0

src/sql/engine/expr/ob_expr_rowid_to_nchar.h

@@ -0,0 +1,42 @@
+/**
+ * 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_ROWID_TO_NCHAR_
+#define OCEANBASE_SQL_ENGINE_EXPR_ROWID_TO_NCHAR_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase
+{
+namespace sql
+{
+
+class ObExprRowIDToNChar : public ObStringExprOperator
+{
+public:
+  explicit  ObExprRowIDToNChar(common::ObIAllocator &alloc);
+  virtual ~ObExprRowIDToNChar();
+  virtual int calc_result_type1(ObExprResType &type,
+                                ObExprResType &text,
+                                common::ObExprTypeCtx &type_ctx) const;
+  virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
+                      const ObRawExpr &raw_expr,
+                      ObExpr &rt_expr) const override;
+
+  static int eval_rowid_to_nchar(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprRowIDToNChar);
+};
+
+}
+}
+#endif /* OCEANBASE_SQL_ENGINE_EXPR_ROWID_TO_NCHAR_ */