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#pragma once
#include <Storages/IStorage.h>
#include <QueryPipeline/Pipe.h>
namespace DB
{
class StorageBlocks : public IStorage
{
/* Storage based on the prepared streams that already contain data blocks.
* Used by Live and Window Views to complete stored query based on the mergeable blocks.
*/
public:
StorageBlocks(const StorageID & table_id_,
const ColumnsDescription & columns_, Pipes pipes_,
QueryProcessingStage::Enum to_stage_)
: IStorage(table_id_), pipes(std::move(pipes_)), to_stage(to_stage_)
{
StorageInMemoryMetadata storage_metadata;
storage_metadata.setColumns(columns_);
setInMemoryMetadata(storage_metadata);
}
static StoragePtr createStorage(const StorageID & table_id,
const ColumnsDescription & columns, Pipes pipes, QueryProcessingStage::Enum to_stage)
{
return std::make_shared<StorageBlocks>(table_id, columns, std::move(pipes), to_stage);
}
std::string getName() const override { return "Blocks"; }
/// It is passed inside the query and solved at its level.
bool supportsPrewhere() const override { return true; }
bool supportsSampling() const override { return true; }
bool supportsFinal() const override { return true; }
QueryProcessingStage::Enum
getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum, const StorageSnapshotPtr &, SelectQueryInfo &) const override
{
return to_stage;
}
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
{
return Pipe::unitePipes(std::move(pipes));
}
private:
Pipes pipes;
QueryProcessingStage::Enum to_stage;
};
}
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