ClickHouse/src/Storages/StorageView.h

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#pragma once
#include <Parsers/ASTSelectQuery.h>
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#include <Parsers/IAST_fwd.h>
#include <Storages/IStorage.h>
#include <ext/shared_ptr_helper.h>
namespace DB
{
class StorageView final : public ext::shared_ptr_helper<StorageView>, public IStorage
{
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friend struct ext::shared_ptr_helper<StorageView>;
public:
std::string getName() const override { return "View"; }
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bool isView() const override { return true; }
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/// It is passed inside the query and solved at its level.
bool supportsSampling() const override { return true; }
bool supportsFinal() const override { return true; }
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Pipe read(
const Names & column_names,
const StorageMetadataPtr & /*metadata_snapshot*/,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
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unsigned num_streams) override;
void read(
QueryPlan & query_plan,
TableLockHolder table_lock,
StorageMetadataPtr metadata_snapshot,
StreamLocalLimits & limits,
std::shared_ptr<const EnabledQuota> quota,
const Names & column_names,
const SelectQueryInfo & query_info,
std::shared_ptr<Context> context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
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void replaceWithSubquery(ASTSelectQuery & select_query, ASTPtr & view_name, const StorageMetadataPtr & metadata_snapshot) const
{
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replaceWithSubquery(select_query, metadata_snapshot->getSelectQuery().inner_query->clone(), view_name);
}
static void replaceWithSubquery(ASTSelectQuery & outer_query, ASTPtr view_query, ASTPtr & view_name);
static ASTPtr restoreViewName(ASTSelectQuery & select_query, const ASTPtr & view_name);
protected:
StorageView(
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const StorageID & table_id_,
const ASTCreateQuery & query,
const ColumnsDescription & columns_);
};
}