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85 lines
3.5 KiB
C++
85 lines
3.5 KiB
C++
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#include <DB/Functions/NumberTraits.h>
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#include <DB/Functions/FunctionFactory.h>
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#include <DB/Functions/FunctionsTransform.h>
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namespace DB
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{
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/// TODO: Убрать copy-paste из FunctionsConditional.h
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template <typename T>
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struct DataTypeFromFieldTypeOrError
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{
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static DataTypePtr getDataType()
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{
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return new typename DataTypeFromFieldType<T>::Type;
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}
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};
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template <>
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struct DataTypeFromFieldTypeOrError<NumberTraits::Error>
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{
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static DataTypePtr getDataType()
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{
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return nullptr;
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}
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};
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template <typename T1, typename T2>
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DataTypePtr getSmallestCommonNumericTypeImpl()
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{
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using ResultType = typename NumberTraits::ResultOfIf<T1, T2>::Type;
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auto type_res = DataTypeFromFieldTypeOrError<ResultType>::getDataType();
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if (!type_res)
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throw Exception("Types " + TypeName<T1>::get() + " and " + TypeName<T2>::get()
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+ " are not upscalable to a common type without loss of precision", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return type_res;
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}
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template <typename T1>
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DataTypePtr getSmallestCommonNumericTypeLeft(const IDataType & t2)
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{
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if (typeid_cast<const DataTypeUInt8 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, UInt8>();
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if (typeid_cast<const DataTypeUInt16 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, UInt16>();
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if (typeid_cast<const DataTypeUInt32 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, UInt32>();
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if (typeid_cast<const DataTypeUInt64 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, UInt64>();
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if (typeid_cast<const DataTypeInt8 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Int8>();
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if (typeid_cast<const DataTypeInt16 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Int16>();
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if (typeid_cast<const DataTypeInt32 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Int32>();
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if (typeid_cast<const DataTypeInt64 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Int64>();
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if (typeid_cast<const DataTypeFloat32 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Float32>();
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if (typeid_cast<const DataTypeFloat64 *>(&t2)) return getSmallestCommonNumericTypeImpl<T1, Float64>();
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throw Exception("Logical error: not a numeric type passed to function getSmallestCommonNumericType", ErrorCodes::LOGICAL_ERROR);
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}
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DataTypePtr getSmallestCommonNumericType(const IDataType & t1, const IDataType & t2)
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{
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if (typeid_cast<const DataTypeUInt8 *>(&t1)) return getSmallestCommonNumericTypeLeft<UInt8>(t2);
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if (typeid_cast<const DataTypeUInt16 *>(&t1)) return getSmallestCommonNumericTypeLeft<UInt16>(t2);
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if (typeid_cast<const DataTypeUInt32 *>(&t1)) return getSmallestCommonNumericTypeLeft<UInt32>(t2);
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if (typeid_cast<const DataTypeUInt64 *>(&t1)) return getSmallestCommonNumericTypeLeft<UInt64>(t2);
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if (typeid_cast<const DataTypeInt8 *>(&t1)) return getSmallestCommonNumericTypeLeft<Int8>(t2);
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if (typeid_cast<const DataTypeInt16 *>(&t1)) return getSmallestCommonNumericTypeLeft<Int16>(t2);
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if (typeid_cast<const DataTypeInt32 *>(&t1)) return getSmallestCommonNumericTypeLeft<Int32>(t2);
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if (typeid_cast<const DataTypeInt64 *>(&t1)) return getSmallestCommonNumericTypeLeft<Int64>(t2);
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if (typeid_cast<const DataTypeFloat32 *>(&t1)) return getSmallestCommonNumericTypeLeft<Float32>(t2);
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if (typeid_cast<const DataTypeFloat64 *>(&t1)) return getSmallestCommonNumericTypeLeft<Float64>(t2);
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throw Exception("Logical error: not a numeric type passed to function getSmallestCommonNumericType", ErrorCodes::LOGICAL_ERROR);
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}
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}
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namespace DB
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{
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void registerFunctionsMiscellaneous(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionTransform>();
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}
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}
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