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36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
#pragma once
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#include <TableFunctions/ITableFunction.h>
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#include <Parsers/ASTCreateQuery.h>
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#include <base/types.h>
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namespace DB
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{
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/* viewIfPermitted(query ELSE null('structure'))
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* Works as "view(query)" if the current user has the permissions required to execute "query"; works as "null('structure')" otherwise.
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*/
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class TableFunctionViewIfPermitted : public ITableFunction
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{
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public:
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static constexpr auto name = "viewIfPermitted";
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std::string getName() const override { return name; }
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const ASTSelectWithUnionQuery & getSelectQuery() const;
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const String & table_name, ColumnsDescription cached_columns) const override;
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const char * getStorageTypeName() const override { return "ViewIfPermitted"; }
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void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
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ColumnsDescription getActualTableStructure(ContextPtr context) const override;
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bool isPermitted(const ContextPtr & context, const ColumnsDescription & else_columns) const;
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ASTCreateQuery create;
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ASTPtr else_ast;
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TableFunctionPtr else_table_function;
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};
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}
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