2020-06-08 09:14:58 +00:00
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#pragma once
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#include <memory>
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#include <list>
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#include <vector>
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2020-12-02 12:08:03 +00:00
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#include <set>
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#include <Core/Names.h>
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2020-06-08 09:14:58 +00:00
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namespace DB
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{
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class DataStream;
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class IQueryPlanStep;
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using QueryPlanStepPtr = std::unique_ptr<IQueryPlanStep>;
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class QueryPipeline;
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using QueryPipelinePtr = std::unique_ptr<QueryPipeline>;
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2020-06-19 14:42:01 +00:00
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class Context;
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2020-06-22 14:37:42 +00:00
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class WriteBuffer;
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2020-10-01 17:34:22 +00:00
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class QueryPlan;
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using QueryPlanPtr = std::unique_ptr<QueryPlan>;
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2020-10-07 11:26:29 +00:00
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class Pipe;
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2020-06-08 09:14:58 +00:00
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/// A tree of query steps.
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2020-06-22 10:18:28 +00:00
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/// The goal of QueryPlan is to build QueryPipeline.
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/// QueryPlan let delay pipeline creation which is helpful for pipeline-level optimisations.
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2020-06-08 09:14:58 +00:00
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class QueryPlan
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{
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public:
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2020-06-22 14:37:42 +00:00
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QueryPlan();
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~QueryPlan();
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2020-09-15 17:13:13 +00:00
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QueryPlan(QueryPlan &&);
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QueryPlan & operator=(QueryPlan &&);
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2020-06-19 14:42:01 +00:00
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2020-10-01 17:34:22 +00:00
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void unitePlans(QueryPlanStepPtr step, std::vector<QueryPlanPtr> plans);
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2020-06-08 09:14:58 +00:00
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void addStep(QueryPlanStepPtr step);
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bool isInitialized() const { return root != nullptr; } /// Tree is not empty
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bool isCompleted() const; /// Tree is not empty and root hasOutputStream()
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const DataStream & getCurrentDataStream() const; /// Checks that (isInitialized() && !isCompleted())
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2020-07-23 10:20:38 +00:00
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void optimize();
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2020-06-08 09:14:58 +00:00
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QueryPipelinePtr buildQueryPipeline();
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2020-10-07 11:26:29 +00:00
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/// If initialized, build pipeline and convert to pipe. Otherwise, return empty pipe.
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Pipe convertToPipe();
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2020-06-26 13:58:28 +00:00
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struct ExplainPlanOptions
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2020-06-23 11:26:06 +00:00
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{
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/// Add output header to step.
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bool header = false;
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/// Add description of step.
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bool description = true;
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/// Add detailed information about step actions.
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bool actions = false;
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};
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struct ExplainPipelineOptions
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{
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/// Show header of output ports.
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bool header = false;
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};
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void explainPlan(WriteBuffer & buffer, const ExplainPlanOptions & options);
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void explainPipeline(WriteBuffer & buffer, const ExplainPipelineOptions & options);
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2020-06-22 14:37:42 +00:00
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2020-06-18 17:45:00 +00:00
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/// Set upper limit for the recommend number of threads. Will be applied to the newly-created pipelines.
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/// TODO: make it in a better way.
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void setMaxThreads(size_t max_threads_) { max_threads = max_threads_; }
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2020-10-22 11:08:12 +00:00
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size_t getMaxThreads() const { return max_threads; }
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2020-06-18 17:45:00 +00:00
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2020-06-19 14:42:01 +00:00
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void addInterpreterContext(std::shared_ptr<Context> context);
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2020-06-22 10:18:28 +00:00
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/// Tree node. Step and it's children.
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struct Node
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{
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QueryPlanStepPtr step;
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2020-06-16 14:11:19 +00:00
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std::vector<Node *> children = {};
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2020-06-08 09:14:58 +00:00
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};
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using Nodes = std::list<Node>;
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2020-08-12 13:30:02 +00:00
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private:
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Nodes nodes;
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2020-06-08 09:14:58 +00:00
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Node * root = nullptr;
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void checkInitialized() const;
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void checkNotCompleted() const;
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2020-06-18 17:45:00 +00:00
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2020-06-22 10:18:28 +00:00
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/// Those fields are passed to QueryPipeline.
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2020-06-18 17:45:00 +00:00
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size_t max_threads = 0;
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std::vector<std::shared_ptr<Context>> interpreter_context;
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2020-06-08 09:14:58 +00:00
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};
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}
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