add file headers; remove unused files

src/observer/event/#sql_event.cpp#

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Longda on 2021/4/14.
-//
-
-#include "event/sql_event.h"
-#include "event/session_event.h"
-
-SQLStageEvent::SQLStageEvent(SessionEvent *event, const std::string &sql) : session_event_(event), sql_(sql)
-{}
-
-SQLStageEvent::~SQLStageEvent() noexcept
-{
-  if (session_event_ != nullptr) {
-    session_event_ = nullptr;
-    // SessionEvent *session_event = session_event_;
-    // session_event_ = nullptr;
-    // session_event->doneImmediate();
-  }
-}

src/observer/event/execute_plan_event.cpp.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Wangyunlai on 2021/5/11.
-//
-
-#include "event/execution_plan_event.h"
-#include "event/sql_event.h"
-
-ExecutionPlanEvent::ExecutionPlanEvent(SQLStageEvent *sql_event, Query *sqls) : sql_event_(sql_event), sqls_(sqls)
-{}
-ExecutionPlanEvent::~ExecutionPlanEvent()
-{
-  sql_event_ = nullptr;
-  // if (sql_event_) {
-  //   sql_event_->doneImmediate();
-  // }
-
-  query_destroy(sqls_);
-  sqls_ = nullptr;
-}

src/observer/event/execute_plan_event.h.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Wangyunlai on 2021/5/11.
-//
-
-#pragma once
-
-#include "common/seda/stage_event.h"
-
-class SQLStageEvent;
-
-class ExecutePlanEvent : public common::StageEvent {
-public:
-  ExecutePlanEvent(SQLStageEvent *sql_event, common::StageEvent *parent_event)
-    : sql_event_(sql_event), parent_event_(parent_event)
-  {}
-
-  virtual ~ExecutePlanEvent() = default;
-
-  SQLStageEvent *sql_event() const
-  {
-    return sql_event_;
-  }
-
-  common::StageEvent *parent_event() const {
-    return parent_event_;
-  }
-
-private:
-  SQLStageEvent *sql_event_ = nullptr;
-  common::StageEvent *parent_event_ = nullptr;
-};
-
-#endif  // __OBSERVER_EVENT_EXECUTION_PLAN_EVENT_H__

src/observer/event/query_cache_event.h.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Wangyunlai on 2022/5/23.
-//
-
-#pragma once
-
-#include "common/seda/stage_event.h"
-
-class SQLStageEvent;
-class Stmt;
-
-class QueryCacheEvent : public common::StageEvent {
-public:
-  QueryCacheEvent(SQLStageEvent *sql_event, common::StageEvent *parent_event)
-    : sql_event_(sql_event), parent_event_(parent_event)
-  {}
-
-  virtual ~QueryCacheEvent() noexcept = default;
-
-  SQLStageEvent *sql_event() const {
-    return sql_event_;
-  }
-
-  common::StageEvent *parent_event() const {
-    return parent_event_;
-  }
-
-private:
-  SQLStageEvent *sql_event_ = nullptr;
-  common::StageEvent *parent_event_ = nullptr;
-};
-

src/observer/event/resolve_event.cpp.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Wangyunlai on 2022/5/23.
-//
-
-#include "event/resolve_event.h"
-#include "event/session_event.h"
-
-ResolveStageEvent(SessionEvent *event) : session_event_(event)
-{}
-
-ResolveStageEvent::~ResolveStageEvent() noexcept
-{
-}

src/observer/event/resolve_event.h.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by Wangyunlai on 2022/5/23.
-//
-
-#pragma once
-
-#include "common/seda/stage_event.h"
-
-class SessionEvent;
-class Stmt;
-
-class ResolveStageEvent : public BaseEvent {
-public:
-  ResolveStageEvent(SessionEvent *event);
-  virtual ~ResolveStageEvent() noexcept;
-
-  SessionEvent *session_event() const
-  {
-    return session_event_;
-  }
-
-private:
-  SessionEvent *session_event_ = nullptr;
-};
-

src/observer/sql/operator/index_scan_operator.cpp

+/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
+miniob is licensed under Mulan PSL v2.
+You can use this software according to the terms and conditions of the Mulan PSL v2.
+You may obtain a copy of Mulan PSL v2 at:
+         http://license.coscl.org.cn/MulanPSL2
+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 PSL v2 for more details. */
+
+//
+// Created by Wangyunlai on 2022/07/08.
+//
+
 #include "sql/operator/index_scan_operator.h"
 #include "storage/index/index.h"
 

src/observer/sql/operator/index_scan_operator.h

+/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
+miniob is licensed under Mulan PSL v2.
+You can use this software according to the terms and conditions of the Mulan PSL v2.
+You may obtain a copy of Mulan PSL v2 at:
+         http://license.coscl.org.cn/MulanPSL2
+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 PSL v2 for more details. */
+
+//
+// Created by Wangyunlai on 2022/07/08.
+//
+
 #pragma once
 
 #include "sql/operator/operator.h"

src/observer/sql/operator/join_operator.cpp.bak

-/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
-miniob is licensed under Mulan PSL v2.
-You can use this software according to the terms and conditions of the Mulan PSL v2.
-You may obtain a copy of Mulan PSL v2 at:
-         http://license.coscl.org.cn/MulanPSL2
-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 PSL v2 for more details. */
-
-//
-// Created by WangYunlai on 2021/6/10.
-//
-
-#include "sql/operator/join_operator.h"
-
-RC JoinOperator::open()
-{
-  RC rc = left_->open();
-  if (rc != RC::SUCCESS) {
-    LOG_WARN("failed to open left operator. rc=%d:%s", rc, strrc(rc));
-    return rc;
-  }
-
-  rc = right_->open();
-  if (rc != RC::SUCCESS) {
-    LOG_WARN("failed to open right operator. rc=%d:%s", rc, strrc(rc));
-    return rc;
-  }
-  return rc;
-}
-
-RC JoinOperator::step_right()
-{
-  rc = right_->next();
-  while (rc == RC::SUCCESS) {
-    if (predicate_->filter()) {
-      return rc;
-    }
-
-    rc = right_->next();
-  }
-  return rc;
-}
-
-RC JoinOperator::next()
-{
-  RC rc = RC::SUCCESS;
-  while (true) {
-    if (round_done_) {
-      rc = left_->next();
-      if (rc != RC::SUCCESS) {
-        return rc;
-      }
-
-      round_done_ = false;
-
-      right_->close();
-      right_->open(); // TODO
-    }
-
-    rc = step_right();
-    if (rc == RC::SUCCESS) {
-      return rc;
-    }
-
-    if (rc == RC::RECORD_EOF) {
-      round_done_ = true;
-    } else {
-      return rc;
-    }
-  }
-
-  return RC::RECORD_EOF;
-}
-
-RC JoinOperator::close()
-{
-  left_->close();
-  right_->close();
-  return RC::SUCCESS;
-}