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