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56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
#pragma once
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#include <Storages/ColumnsDescription.h>
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namespace DB
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{
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/** Description of the table.
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* Is not thread safe. See IStorage::lockStructure ().
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*/
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class ITableDeclaration
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{
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public:
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virtual const ColumnsDescription & getColumns() const { return columns; }
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virtual void setColumns(ColumnsDescription columns_);
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/// NOTE: These methods should include virtual columns, but should NOT include ALIAS columns
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/// (they are treated separately).
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virtual NameAndTypePair getColumn(const String & column_name) const;
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virtual bool hasColumn(const String & column_name) const;
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Block getSampleBlock() const;
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Block getSampleBlockNonMaterialized() const;
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Block getSampleBlockForColumns(const Names & column_names) const;
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/** Verify that all the requested names are in the table and are set correctly.
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* (the list of names is not empty and the names do not repeat)
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*/
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void check(const Names & column_names) const;
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/** Check that all the requested names are in the table and have the correct types.
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*/
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void check(const NamesAndTypesList & columns) const;
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/** Check that all names from the intersection of `names` and `columns` are in the table and have the same types.
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*/
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void check(const NamesAndTypesList & columns, const Names & column_names) const;
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/** Check that the data block for the record contains all the columns of the table with the correct types,
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* contains only the columns of the table, and all the columns are different.
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* If need_all, still checks that all the columns of the table are in the block.
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*/
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void check(const Block & block, bool need_all = false) const;
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ITableDeclaration() = default;
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explicit ITableDeclaration(ColumnsDescription columns_);
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virtual ~ITableDeclaration() = default;
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private:
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ColumnsDescription columns;
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};
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}
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