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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
#pragma once
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#include <Parsers/ASTSelectQuery.h>
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#include <Parsers/IAST_fwd.h>
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#include <Storages/IStorage.h>
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#include <ext/shared_ptr_helper.h>
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namespace DB
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{
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class StorageView final : public ext::shared_ptr_helper<StorageView>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageView>;
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public:
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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.
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bool supportsSampling() const override { return true; }
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bool supportsFinal() const override { return true; }
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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const SelectQueryInfo & query_info,
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const Context & context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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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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{
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replaceWithSubquery(select_query, metadata_snapshot->getSelectQuery().inner_query->clone(), view_name);
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}
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static void replaceWithSubquery(ASTSelectQuery & outer_query, ASTPtr view_query, ASTPtr & view_name);
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static ASTPtr restoreViewName(ASTSelectQuery & select_query, const ASTPtr & view_name);
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protected:
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StorageView(
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const StorageID & table_id_,
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const ASTCreateQuery & query,
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const ColumnsDescription & columns_);
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};
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}
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