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495c6e03aa
* Replace all Context references with std::weak_ptr * Fix shared context captured by value * Fix build * Fix Context with named sessions * Fix copy context * Fix gcc build * Merge with master and fix build * Fix gcc-9 build
34 lines
860 B
C++
34 lines
860 B
C++
#pragma once
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#include <ext/shared_ptr_helper.h>
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#include <Storages/System/IStorageSystemOneBlock.h>
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namespace DB
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{
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class Context;
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/** Implements system table 'columns', that allows to get information about columns for every table.
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*/
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class StorageSystemColumns final : public ext::shared_ptr_helper<StorageSystemColumns>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageSystemColumns>;
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public:
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std::string getName() const override { return "SystemColumns"; }
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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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SelectQueryInfo & query_info,
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ContextPtr 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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protected:
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StorageSystemColumns(const StorageID & table_id_);
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};
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}
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