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57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <Interpreters/Cluster.h>
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#include <QueryPipeline/RemoteQueryExecutor.h>
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#include <Parsers/ASTExpressionList.h>
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namespace DB
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{
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/**
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* Base cluster for Storages used in table functions like s3Cluster and hdfsCluster
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* Needed for code simplification around parallel_distributed_insert_select
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*/
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class IStorageCluster : public IStorage
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{
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public:
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IStorageCluster(
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const String & cluster_name_,
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const StorageID & table_id_,
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Poco::Logger * log_,
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bool structure_argument_was_provided_);
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Pipe read(
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const Names & column_names,
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const StorageSnapshotPtr & storage_snapshot,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t /*max_block_size*/,
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size_t /*num_streams*/) override;
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ClusterPtr getCluster(ContextPtr context) const;
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/// Query is needed for pruning by virtual columns (_file, _path)
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virtual RemoteQueryExecutor::Extension getTaskIteratorExtension(ASTPtr query, const ContextPtr & context) const = 0;
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QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum, const StorageSnapshotPtr &, SelectQueryInfo &) const override;
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bool isRemote() const override { return true; }
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protected:
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virtual void updateBeforeRead(const ContextPtr &) {}
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virtual void addColumnsStructureToQuery(ASTPtr & query, const String & structure, const ContextPtr & context) = 0;
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private:
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ContextPtr updateSettings(ContextPtr context, const Settings & settings);
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Poco::Logger * log;
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String cluster_name;
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bool structure_argument_was_provided;
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};
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}
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