support set names/charset and variables in one sql

src/sql/engine/cmd/ob_set_names_executor.h

@@ -1,42 +0,0 @@
-/**
- * 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 _OB_SET_NAMES_EXECUTOR_H
-#define _OB_SET_NAMES_EXECUTOR_H 1
-#include "sql/resolver/cmd/ob_set_names_stmt.h"
-namespace oceanbase {
-namespace sql {
-class ObExecContext;
-class ObSetNamesExecutor {
-public:
-  ObSetNamesExecutor()
-  {}
-  virtual ~ObSetNamesExecutor()
-  {}
-
-  int execute(ObExecContext& ctx, ObSetNamesStmt& stmt);
-
-private:
-  int get_global_sys_var_character_set_client(ObExecContext& ctx, common::ObString& character_set_client) const;
-
-private:
-  // disallow copy
-  DISALLOW_COPY_AND_ASSIGN(ObSetNamesExecutor);
-  // function members
-private:
-  // data members
-};
-
-}  // end namespace sql
-}  // end namespace oceanbase
-
-#endif /* _OB_SET_NAMES_EXECUTOR_H */