be/src/vec/exec/scan/scan_node.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include "vec/exec/scan/scanner.h"

namespace doris::vectorized {

class Scanner;
class VSlotRef;

// We want to close scanner automatically, so using a delegate class
// and call close method in the delegate class's destructor.
class ScannerDelegate {
public:
    ScannerSPtr _scanner;
    ScannerDelegate(ScannerSPtr& scanner_ptr) : _scanner(scanner_ptr) {}
    ~ScannerDelegate() {
        SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(_scanner->runtime_state()->query_mem_tracker());
        Status st = _scanner->close(_scanner->runtime_state());
        if (!st.ok()) {
            LOG(WARNING) << "close scanner failed, st = " << st;
        }
        _scanner.reset();
    }
    ScannerDelegate(ScannerDelegate&&) = delete;
};

} // namespace doris::vectorized