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28 lines
722 B
C++
28 lines
722 B
C++
#pragma once
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#include <TableFunctions/ITableFunction.h>
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#include <Core/Types.h>
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namespace DB
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{
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/* numbers(limit), numbers_mt(limit)
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* - the same as SELECT number FROM system.numbers LIMIT limit.
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* Used for testing purposes, as a simple example of table function.
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*/
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template <bool multithreaded>
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class TableFunctionNumbers : public ITableFunction
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{
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public:
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static constexpr auto name = multithreaded ? "numbers_mt" : "numbers";
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std::string getName() const override { return name; }
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name) const override;
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UInt64 evaluateArgument(const Context & context, ASTPtr & argument) const;
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};
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}
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