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110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionsRandom.h>
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#include <DataTypes/DataTypeUUID.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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#define DECLARE_SEVERAL_IMPLEMENTATIONS(...) \
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DECLARE_DEFAULT_CODE (__VA_ARGS__) \
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DECLARE_AVX2_SPECIFIC_CODE(__VA_ARGS__)
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DECLARE_SEVERAL_IMPLEMENTATIONS(
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class FunctionGenerateUUIDv4 : public IFunction
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{
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public:
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static constexpr auto name = "generateUUIDv4";
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String getName() const override
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{
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return name;
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}
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size_t getNumberOfArguments() const override { return 0; }
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bool isDeterministicInScopeOfQuery() const override { return false; }
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bool useDefaultImplementationForNulls() const override { return false; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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bool isVariadic() const override { return true; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.size() > 1)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
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"Number of arguments for function {} doesn't match: passed {}, should be 0 or 1.",
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getName(), arguments.size());
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return std::make_shared<DataTypeUUID>();
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}
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bool isDeterministic() const override { return false; }
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
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{
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auto col_res = ColumnVector<UUID>::create();
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typename ColumnVector<UUID>::Container & vec_to = col_res->getData();
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size_t size = input_rows_count;
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vec_to.resize(size);
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/// RandImpl is target-dependent and is not the same in different TargetSpecific namespaces.
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RandImpl::execute(reinterpret_cast<char *>(vec_to.data()), vec_to.size() * sizeof(UUID));
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for (UUID & uuid : vec_to)
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{
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/// https://tools.ietf.org/html/rfc4122#section-4.4
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UUIDHelpers::getHighBytes(uuid) = (UUIDHelpers::getHighBytes(uuid) & 0xffffffffffff0fffull) | 0x0000000000004000ull;
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UUIDHelpers::getLowBytes(uuid) = (UUIDHelpers::getLowBytes(uuid) & 0x3fffffffffffffffull) | 0x8000000000000000ull;
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}
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return col_res;
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}
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};
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) // DECLARE_SEVERAL_IMPLEMENTATIONS
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#undef DECLARE_SEVERAL_IMPLEMENTATIONS
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class FunctionGenerateUUIDv4 : public TargetSpecific::Default::FunctionGenerateUUIDv4
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{
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public:
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explicit FunctionGenerateUUIDv4(ContextPtr context) : selector(context)
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{
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selector.registerImplementation<TargetArch::Default,
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TargetSpecific::Default::FunctionGenerateUUIDv4>();
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#if USE_MULTITARGET_CODE
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selector.registerImplementation<TargetArch::AVX2,
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TargetSpecific::AVX2::FunctionGenerateUUIDv4>();
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#endif
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
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{
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return selector.selectAndExecute(arguments, result_type, input_rows_count);
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}
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static FunctionPtr create(ContextPtr context)
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{
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return std::make_shared<FunctionGenerateUUIDv4>(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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REGISTER_FUNCTION(GenerateUUIDv4)
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{
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factory.registerFunction<FunctionGenerateUUIDv4>();
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}
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}
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