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108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnsNumber.h>
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#include <Functions/FunctionArrayMapped.h>
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#include <Functions/FunctionFactory.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_COLUMN;
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}
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/** arrayDifference() - returns an array with the difference between all pairs of neighboring elements.
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*/
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struct ArrayDifferenceImpl
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{
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static bool useDefaultImplementationForConstants() { return true; }
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static bool needBoolean() { return false; }
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static bool needExpression() { return false; }
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static bool needOneArray() { return false; }
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static DataTypePtr getReturnType(const DataTypePtr & expression_return, const DataTypePtr & /*array_element*/)
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{
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WhichDataType which(expression_return);
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if (which.isUInt8() || which.isInt8())
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt16>());
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if (which.isUInt16() || which.isInt16())
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt32>());
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if (which.isUInt32() || which.isUInt64() || which.isInt32() || which.isInt64())
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt64>());
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if (which.isFloat32() || which.isFloat64())
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeFloat64>());
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throw Exception("arrayDifference cannot process values of type " + expression_return->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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template <typename Element, typename Result>
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static bool executeType(const ColumnPtr & mapped, const ColumnArray & array, ColumnPtr & res_ptr)
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{
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const ColumnVector<Element> * column = checkAndGetColumn<ColumnVector<Element>>(&*mapped);
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if (!column)
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return false;
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const IColumn::Offsets & offsets = array.getOffsets();
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const typename ColumnVector<Element>::Container & data = column->getData();
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auto res_nested = ColumnVector<Result>::create();
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typename ColumnVector<Result>::Container & res_values = res_nested->getData();
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res_values.resize(data.size());
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size_t pos = 0;
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for (size_t i = 0; i < offsets.size(); ++i)
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{
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// skip empty arrays
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if (pos < offsets[i])
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{
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res_values[pos] = 0;
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for (++pos; pos < offsets[i]; ++pos)
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{
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res_values[pos] = static_cast<Result>(data[pos]) - static_cast<Result>(data[pos - 1]);
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}
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}
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}
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res_ptr = ColumnArray::create(std::move(res_nested), array.getOffsetsPtr());
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return true;
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}
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static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
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{
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ColumnPtr res;
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if (executeType< UInt8 , Int16>(mapped, array, res) ||
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executeType< UInt16, Int32>(mapped, array, res) ||
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executeType< UInt32, Int64>(mapped, array, res) ||
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executeType< UInt64, Int64>(mapped, array, res) ||
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executeType< Int8 , Int16>(mapped, array, res) ||
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executeType< Int16, Int32>(mapped, array, res) ||
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executeType< Int32, Int64>(mapped, array, res) ||
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executeType< Int64, Int64>(mapped, array, res) ||
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executeType<Float32,Float64>(mapped, array, res) ||
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executeType<Float64,Float64>(mapped, array, res))
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return res;
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else
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throw Exception("Unexpected column for arrayDifference: " + mapped->getName(), ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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struct NameArrayDifference { static constexpr auto name = "arrayDifference"; };
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using FunctionArrayDifference = FunctionArrayMapped<ArrayDifferenceImpl, NameArrayDifference>;
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void registerFunctionArrayDifference(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionArrayDifference>();
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}
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}
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