45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
// 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.
|
|
// This file is copied from
|
|
// https://github.com/ClickHouse/ClickHouse/blob/master/src/AggregateFunctions/ColumnNothing.h
|
|
// and modified by Doris
|
|
|
|
#pragma once
|
|
|
|
#include "vec/columns/column_dummy.h"
|
|
|
|
namespace doris::vectorized {
|
|
|
|
class ColumnNothing final : public COWHelper<IColumnDummy, ColumnNothing> {
|
|
private:
|
|
friend class COWHelper<IColumnDummy, ColumnNothing>;
|
|
|
|
ColumnNothing(size_t s_) { s = s_; }
|
|
|
|
ColumnNothing(const ColumnNothing&) = default;
|
|
|
|
public:
|
|
const char* get_family_name() const override { return "Nothing"; }
|
|
MutableColumnPtr clone_dummy(size_t s_) const override { return ColumnNothing::create(s_); }
|
|
|
|
bool structure_equals(const IColumn& rhs) const override {
|
|
return typeid(rhs) == typeid(ColumnNothing);
|
|
}
|
|
};
|
|
|
|
} // namespace doris::vectorized
|