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50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
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#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/TableFunctionNumbers.h>
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#include <TableFunctions/TableFunctionFactory.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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#include <Common/Exception.h>
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#include <Storages/System/StorageSystemNumbers.h>
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#include <Interpreters/evaluateConstantExpression.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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StoragePtr TableFunctionNumbers::execute(const ASTPtr & ast_function, const Context & context) const
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{
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ASTs & args_func = typeid_cast<ASTFunction &>(*ast_function).children;
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if (args_func.size() != 1)
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throw Exception("Table function 'numbers' requires exactly one argument: amount of numbers.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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ASTs & args = typeid_cast<ASTExpressionList &>(*args_func.at(0)).children;
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if (args.size() != 1)
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throw Exception("Table function 'numbers' requires exactly one argument: amount of numbers.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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args[0] = evaluateConstantExpressionOrIdentidierAsLiteral(args[0], context);
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UInt64 limit = static_cast<const ASTLiteral &>(*args[0]).value.safeGet<UInt64>();
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auto res = StorageSystemNumbers::create(getName(), false, limit);
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res->startup();
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return res;
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}
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void registerTableFunctionNumbers(TableFunctionFactory & factory)
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{
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TableFunctionFactory::instance().registerFunction<TableFunctionNumbers>();
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}
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}
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