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#pragma once
#include <Processors/QueryPlan/ISourceStep.h>
#include <Core/QueryProcessingStage.h>
#include <Client/IConnections.h>
#include <Storages/IStorage_fwd.h>
#include <Interpreters/StorageID.h>
#include <Interpreters/ClusterProxy/SelectStreamFactory.h>
#include <Storages/MergeTree/ParallelReplicasReadingCoordinator.h>
#include "Core/UUID.h"
namespace DB
{
class ConnectionPoolWithFailover;
using ConnectionPoolWithFailoverPtr = std::shared_ptr<ConnectionPoolWithFailover>;
class Throttler;
using ThrottlerPtr = std::shared_ptr<Throttler>;
/// Reading step from remote servers.
/// Unite query results from several shards.
class ReadFromRemote final : public ISourceStep
{
public:
/// @param main_table_ if Shards contains main_table then this parameter will be ignored
ReadFromRemote(
ClusterProxy::SelectStreamFactory::Shards shards_,
Block header_,
QueryProcessingStage::Enum stage_,
StorageID main_table_,
ASTPtr table_func_ptr_,
ContextMutablePtr context_,
ThrottlerPtr throttler_,
Scalars scalars_,
Tables external_tables_,
Poco::Logger * log_,
UInt32 shard_count_,
std::shared_ptr<const StorageLimitsList> storage_limits_,
const String & cluster_name_);
String getName() const override { return "ReadFromRemote"; }
void initializePipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &) override;
void enforceSorting(SortDescription output_sort_description);
void enforceAggregationInOrder();
private:
ClusterProxy::SelectStreamFactory::Shards shards;
QueryProcessingStage::Enum stage;
StorageID main_table;
ASTPtr table_func_ptr;
ContextMutablePtr context;
ThrottlerPtr throttler;
Scalars scalars;
Tables external_tables;
std::shared_ptr<const StorageLimitsList> storage_limits;
Poco::Logger * log;
UInt32 shard_count;
String cluster_name;
void addLazyPipe(Pipes & pipes, const ClusterProxy::SelectStreamFactory::Shard & shard);
void addPipe(Pipes & pipes, const ClusterProxy::SelectStreamFactory::Shard & shard);
};
class ReadFromParallelRemoteReplicasStep : public ISourceStep
{
public:
ReadFromParallelRemoteReplicasStep(
ASTPtr query_ast_,
ClusterPtr cluster_,
ParallelReplicasReadingCoordinatorPtr coordinator_,
Block header_,
QueryProcessingStage::Enum stage_,
StorageID main_table_,
ASTPtr table_func_ptr_,
ContextMutablePtr context_,
ThrottlerPtr throttler_,
Scalars scalars_,
Tables external_tables_,
Poco::Logger * log_,
std::shared_ptr<const StorageLimitsList> storage_limits_);
String getName() const override { return "ReadFromRemoteParallelReplicas"; }
void initializePipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &) override;
void enforceSorting(SortDescription output_sort_description);
void enforceAggregationInOrder();
private:
void addPipeForSingeReplica(Pipes & pipes, std::shared_ptr<ConnectionPoolWithFailover> pool, IConnections::ReplicaInfo replica_info);
ClusterPtr cluster;
ASTPtr query_ast;
ParallelReplicasReadingCoordinatorPtr coordinator;
QueryProcessingStage::Enum stage;
StorageID main_table;
ASTPtr table_func_ptr;
ContextMutablePtr context;
ThrottlerPtr throttler;
Scalars scalars;
Tables external_tables;
std::shared_ptr<const StorageLimitsList> storage_limits;
Poco::Logger * log;
};
}
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