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115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
#pragma once
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#include <Processors/QueryPlan/ISourceStep.h>
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#include <Core/QueryProcessingStage.h>
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#include <Client/IConnections.h>
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#include <Storages/IStorage_fwd.h>
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#include <Interpreters/StorageID.h>
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#include <Interpreters/ClusterProxy/SelectStreamFactory.h>
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#include <Storages/MergeTree/ParallelReplicasReadingCoordinator.h>
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namespace DB
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{
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class ConnectionPoolWithFailover;
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using ConnectionPoolWithFailoverPtr = std::shared_ptr<ConnectionPoolWithFailover>;
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class Throttler;
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using ThrottlerPtr = std::shared_ptr<Throttler>;
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/// Reading step from remote servers.
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/// Unite query results from several shards.
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class ReadFromRemote final : public ISourceStep
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{
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public:
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ReadFromRemote(
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ClusterProxy::SelectStreamFactory::Shards shards_,
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Block header_,
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QueryProcessingStage::Enum stage_,
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StorageID main_table_,
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ASTPtr table_func_ptr_,
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ContextPtr context_,
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ThrottlerPtr throttler_,
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Scalars scalars_,
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Tables external_tables_,
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Poco::Logger * log_,
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UInt32 shard_count_,
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std::shared_ptr<const StorageLimitsList> storage_limits_);
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String getName() const override { return "ReadFromRemote"; }
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void initializePipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &) override;
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private:
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enum class Mode
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{
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PerReplica,
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PerShard
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};
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ClusterProxy::SelectStreamFactory::Shards shards;
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QueryProcessingStage::Enum stage;
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StorageID main_table;
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ASTPtr table_func_ptr;
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ContextPtr context;
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ThrottlerPtr throttler;
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Scalars scalars;
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Tables external_tables;
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std::shared_ptr<const StorageLimitsList> storage_limits;
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Poco::Logger * log;
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UInt32 shard_count;
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void addLazyPipe(Pipes & pipes, const ClusterProxy::SelectStreamFactory::Shard & shard);
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void addPipe(Pipes & pipes, const ClusterProxy::SelectStreamFactory::Shard & shard);
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};
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class ReadFromParallelRemoteReplicasStep : public ISourceStep
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{
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public:
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ReadFromParallelRemoteReplicasStep(
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ParallelReplicasReadingCoordinatorPtr coordinator_,
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ClusterProxy::SelectStreamFactory::Shard shard,
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Block header_,
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QueryProcessingStage::Enum stage_,
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StorageID main_table_,
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ASTPtr table_func_ptr_,
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ContextPtr context_,
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ThrottlerPtr throttler_,
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Scalars scalars_,
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Tables external_tables_,
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Poco::Logger * log_,
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std::shared_ptr<const StorageLimitsList> storage_limits_);
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String getName() const override { return "ReadFromRemoteParallelReplicas"; }
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void initializePipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &) override;
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private:
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void addPipeForSingeReplica(Pipes & pipes, std::shared_ptr<ConnectionPoolWithFailover> pool, IConnections::ReplicaInfo replica_info);
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ParallelReplicasReadingCoordinatorPtr coordinator;
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ClusterProxy::SelectStreamFactory::Shard shard;
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QueryProcessingStage::Enum stage;
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StorageID main_table;
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ASTPtr table_func_ptr;
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ContextPtr context;
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ThrottlerPtr throttler;
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Scalars scalars;
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Tables external_tables;
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std::shared_ptr<const StorageLimitsList> storage_limits;
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Poco::Logger * log;
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};
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}
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