ClickHouse/src/Storages/StorageValues.h

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#pragma once
#include <ext/shared_ptr_helper.h>
#include <Storages/IStorage.h>
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namespace DB
{
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/* One block storage used for values table function
* It's structure is similar to IStorageSystemOneBlock
*/
class StorageValues final : public ext::shared_ptr_helper<StorageValues>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageValues>;
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public:
std::string getName() const override { return "Values"; }
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Pipe read(
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const Names & column_names,
const StorageMetadataPtr & /*metadata_snapshot*/,
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const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
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/// Why we may have virtual columns in the storage from a single block?
/// Because it used as tmp storage for pushing blocks into views, and some
/// views may contain virtual columns from original storage.
NamesAndTypesList getVirtuals() const override
{
return virtuals;
}
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private:
Block res_block;
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NamesAndTypesList virtuals;
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protected:
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StorageValues(
const StorageID & table_id_, const ColumnsDescription & columns_, const Block & res_block_, const NamesAndTypesList & virtuals_ = {});
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};
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}