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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
#include <Columns/ColumnFixedString.h>
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#include <DataTypes/DataTypeFixedString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/IFunctionImpl.h>
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#include <Functions/PerformanceAdaptors.h>
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#include <Functions/FunctionsRandom.h>
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#include <pcg_random.hpp>
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#include <Common/randomSeed.h>
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#include <common/arithmeticOverflow.h>
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#include <common/unaligned.h>
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#include <common/defines.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 ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int ILLEGAL_COLUMN;
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extern const int DECIMAL_OVERFLOW;
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}
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namespace
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{
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/* Generate random fixed string with fully random bytes (including zero). */
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template <typename RandImpl>
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class FunctionRandomFixedStringImpl : public IFunction
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{
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public:
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static constexpr auto name = "randomFixedString";
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String getName() const override { return name; }
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bool isVariadic() const override { return false; }
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size_t getNumberOfArguments() const override { return 1; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (!isUnsignedInteger(arguments[0].type))
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throw Exception("First argument for function " + getName() + " must be unsigned integer", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!arguments[0].column || !isColumnConst(*arguments[0].column))
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throw Exception("First argument for function " + getName() + " must be constant", ErrorCodes::ILLEGAL_COLUMN);
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const size_t n = assert_cast<const ColumnConst &>(*arguments[0].column).getValue<UInt64>();
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return std::make_shared<DataTypeFixedString>(n);
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}
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bool isDeterministic() const override { return false; }
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bool isDeterministicInScopeOfQuery() const override { return false; }
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void executeImpl(ColumnsWithTypeAndName & columns, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override
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{
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const size_t n = assert_cast<const ColumnConst &>(*columns[arguments[0]].column).getValue<UInt64>();
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auto col_to = ColumnFixedString::create(n);
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ColumnFixedString::Chars & data_to = col_to->getChars();
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if (input_rows_count == 0)
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{
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columns[result].column = std::move(col_to);
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return;
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}
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size_t total_size;
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if (common::mulOverflow(input_rows_count, n, total_size))
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throw Exception("Decimal math overflow", ErrorCodes::DECIMAL_OVERFLOW);
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/// Fill random bytes.
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data_to.resize(total_size);
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RandImpl::execute(reinterpret_cast<char *>(data_to.data()), total_size);
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columns[result].column = std::move(col_to);
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}
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};
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class FunctionRandomFixedString : public FunctionRandomFixedStringImpl<TargetSpecific::Default::RandImpl>
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{
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public:
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explicit FunctionRandomFixedString(const Context & context) : selector(context)
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{
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selector.registerImplementation<TargetArch::Default,
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FunctionRandomFixedStringImpl<TargetSpecific::Default::RandImpl>>();
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#if USE_MULTITARGET_CODE
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selector.registerImplementation<TargetArch::AVX2,
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FunctionRandomFixedStringImpl<TargetSpecific::AVX2::RandImpl>>();
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#endif
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}
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void executeImpl(ColumnsWithTypeAndName & columns, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override
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{
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selector.selectAndExecute(columns, arguments, result, input_rows_count);
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}
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static FunctionPtr create(const Context & context)
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{
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return std::make_shared<FunctionRandomFixedString>(context);
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}
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private:
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ImplementationSelector<IFunction> selector;
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};
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}
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void registerFunctionRandomFixedString(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionRandomFixedString>();
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}
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}
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