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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
#pragma once
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#include <DataStreams/IBlockInputStream.h>
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#include <Processors/Pipe.h>
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#include <Processors/RowsBeforeLimitCounter.h>
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namespace DB
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{
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class ISourceWithProgress;
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/// It's a wrapper from processors tree-shaped pipeline to block input stream.
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/// Execute all processors in a single thread, by in-order tree traverse.
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/// Also, support for progress and quotas.
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class TreeExecutorBlockInputStream : public IBlockInputStream
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{
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public:
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/// Last processor in list must be a tree root.
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/// It is checked that
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/// * processors form a tree
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/// * all processors are attainable from root
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/// * there is no other connected processors
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explicit TreeExecutorBlockInputStream(Pipe pipe) : output_port(pipe.getPort())
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{
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for (auto & table_lock : pipe.getTableLocks())
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addTableLock(table_lock);
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for (auto & storage : pipe.getStorageHolders())
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storage_holders.emplace_back(storage);
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for (auto & context : pipe.getContexts())
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interpreter_context.emplace_back(context);
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totals_port = pipe.getTotalsPort();
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processors = std::move(pipe).detachProcessors();
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init();
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}
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String getName() const override { return "TreeExecutor"; }
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Block getHeader() const override { return root->getOutputs().front().getHeader(); }
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/// This methods does not affect TreeExecutor as IBlockInputStream itself.
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/// They just passed to all SourceWithProgress processors.
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void setProgressCallback(const ProgressCallback & callback) final;
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void setProcessListElement(QueryStatus * elem) final;
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void setLimits(const LocalLimits & limits_) final;
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void setQuota(const std::shared_ptr<const EnabledQuota> & quota_) final;
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void addTotalRowsApprox(size_t value) final;
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protected:
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Block readImpl() override;
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private:
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OutputPort & output_port;
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OutputPort * totals_port = nullptr;
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Processors processors;
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IProcessor * root = nullptr;
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std::unique_ptr<InputPort> input_port;
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std::unique_ptr<InputPort> input_totals_port;
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RowsBeforeLimitCounterPtr rows_before_limit_at_least;
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/// Remember sources that support progress.
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std::vector<ISourceWithProgress *> sources_with_progress;
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QueryStatus * process_list_element = nullptr;
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void init();
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/// Execute tree step-by-step until root returns next chunk or execution is finished.
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void execute(bool on_totals);
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void initRowsBeforeLimit();
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/// Moved from pipe.
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std::vector<std::shared_ptr<Context>> interpreter_context;
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std::vector<StoragePtr> storage_holders;
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};
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}
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