2013-10-30 13:52:02 +00:00
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#pragma once
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2018-08-16 02:55:52 +00:00
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#include <Parsers/ASTSelectQuery.h>
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2019-03-11 14:01:45 +00:00
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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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2013-10-30 13:52:02 +00:00
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namespace DB
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{
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2020-03-19 23:48:53 +00:00
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class StorageView final : public ext::shared_ptr_helper<StorageView>, public IStorage
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2014-10-29 01:18:50 +00:00
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{
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2019-08-26 19:07:29 +00:00
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friend struct ext::shared_ptr_helper<StorageView>;
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2013-10-30 13:52:02 +00:00
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public:
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2017-04-01 07:20:54 +00:00
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std::string getName() const override { return "View"; }
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2020-01-24 16:20:36 +00:00
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bool isView() const override { return true; }
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2013-11-08 17:43:03 +00:00
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2017-04-16 15:00:33 +00:00
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/// It is passed inside the query and solved at its level.
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2017-04-01 07:20:54 +00:00
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bool supportsSampling() const override { return true; }
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2017-07-25 21:07:05 +00:00
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bool supportsFinal() const override { return true; }
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2014-10-07 23:08:56 +00:00
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2020-08-03 13:54:14 +00:00
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Pipe read(
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2017-04-01 07:20:54 +00:00
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const Names & column_names,
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2020-06-15 19:08:58 +00:00
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const StorageMetadataPtr & /*metadata_snapshot*/,
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2017-07-15 03:48:36 +00:00
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const SelectQueryInfo & query_info,
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2017-04-01 07:20:54 +00:00
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const Context & context,
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2018-04-19 14:47:09 +00:00
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QueryProcessingStage::Enum processed_stage,
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2019-02-18 23:38:44 +00:00
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size_t max_block_size,
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2017-06-02 15:54:39 +00:00
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unsigned num_streams) override;
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2013-11-08 17:43:03 +00:00
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2020-09-17 13:22:24 +00:00
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void read(
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QueryPlan & query_plan,
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TableLockHolder table_lock,
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StorageMetadataPtr metadata_snapshot,
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StreamLocalLimits & limits,
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std::shared_ptr<const EnabledQuota> quota,
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const Names & column_names,
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const SelectQueryInfo & query_info,
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std::shared_ptr<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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2020-06-17 14:06:22 +00:00
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void replaceWithSubquery(ASTSelectQuery & select_query, ASTPtr & view_name, const StorageMetadataPtr & metadata_snapshot) const
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2020-06-15 12:36:10 +00:00
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{
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2020-06-17 14:06:22 +00:00
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replaceWithSubquery(select_query, metadata_snapshot->getSelectQuery().inner_query->clone(), view_name);
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2020-06-15 12:36:10 +00:00
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}
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2020-02-05 08:22:25 +00:00
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2020-06-15 12:36:10 +00:00
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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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2020-02-05 08:22:25 +00:00
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2017-11-04 03:20:18 +00:00
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protected:
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2017-04-01 07:20:54 +00:00
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StorageView(
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2019-12-04 16:06:55 +00:00
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const StorageID & table_id_,
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2017-09-17 18:49:43 +00:00
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const ASTCreateQuery & query,
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2018-03-06 20:18:34 +00:00
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const ColumnsDescription & columns_);
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2013-10-30 13:52:02 +00:00
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};
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}
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