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51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/* Copyright (c) 2018 BlackBerry Limited
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#include <DataStreams/IBlockInputStream.h>
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#include <Processors/Sources/SourceWithProgress.h>
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namespace DB
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{
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/** A stream of blocks from a shared vector of blocks
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*/
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class BlocksSource : public SourceWithProgress
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{
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public:
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/// Acquires shared ownership of the blocks vector
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BlocksSource(const std::shared_ptr<BlocksPtr> & blocks_ptr_, Block header)
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: SourceWithProgress(std::move(header))
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, blocks(*blocks_ptr_), it((*blocks_ptr_)->begin()), end((*blocks_ptr_)->end()) {}
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String getName() const override { return "Blocks"; }
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protected:
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Chunk generate() override
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{
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if (it == end)
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return {};
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Block res = *it;
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++it;
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return Chunk(res.getColumns(), res.rows());
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}
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private:
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BlocksPtr blocks;
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Blocks::iterator it;
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const Blocks::iterator end;
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};
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}
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