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52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
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#pragma once
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#include <Processors/IProcessor.h>
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#include <Interpreters/SubqueryForSet.h>
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#include <Common/Stopwatch.h>
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namespace DB
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{
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/// This processor creates sets during execution.
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/// Don't return any data. Sets are created when Finish status is returned.
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/// In general, several work() methods need to be called to finish.
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/// TODO: several independent processors can be created for each subquery. Make subquery a piece of pipeline.
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class CreatingSetsTransform : public IProcessor
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{
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public:
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CreatingSetsTransform(
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Block out_header,
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const SubqueriesForSets & subqueries_for_sets_,
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const SizeLimits & network_transfer_limits);
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Status prepare() override;
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void work() override;
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protected:
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bool finished = false;
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private:
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SubqueriesForSets subqueries_for_sets;
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SubqueriesForSets::iterator cur_subquery;
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bool started_cur_subquery = false;
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BlockOutputStreamPtr table_out;
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UInt64 elapsed_nanoseconds = 0;
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bool done_with_set = true;
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bool done_with_join = true;
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bool done_with_table = true;
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SizeLimits network_transfer_limits;
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size_t rows_to_transfer = 0;
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size_t bytes_to_transfer = 0;
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using Logger = Poco::Logger;
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Logger * log = &Logger::get("CreatingSetsBlockInputStream");
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void startSubquery(SubqueryForSet & subquery);
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void finishSubquery(SubqueryForSet & subquery);
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};
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}
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