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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/IFunction.h>
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#include <IO/WriteHelpers.h>
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#include <Common/typeid_cast.h>
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#include <ext/range.h>
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#include <constants.h>
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#include <h3api.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 ARGUMENT_OUT_OF_BOUND;
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}
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namespace
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{
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class FunctionH3EdgeAngle : public IFunction
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{
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public:
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static constexpr auto name = "h3EdgeAngle";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3EdgeAngle>(); }
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std::string getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 1; }
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bool useDefaultImplementationForConstants() const override { return true; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const auto * arg = arguments[0].get();
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if (!WhichDataType(arg).isUInt8())
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throw Exception(
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"Illegal type " + arg->getName() + " of argument " + std::to_string(1) + " of function " + getName() + ". Must be UInt8",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeFloat64>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override
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{
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const auto * col_hindex = block[arguments[0]].column.get();
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auto dst = ColumnVector<Float64>::create();
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auto & dst_data = dst->getData();
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dst_data.resize(input_rows_count);
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for (const auto row : ext::range(0, input_rows_count))
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{
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const int resolution = col_hindex->getUInt(row);
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if (resolution > MAX_H3_RES)
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throw Exception("The argument 'resolution' (" + toString(resolution) + ") of function " + getName()
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+ " is out of bounds because the maximum resolution in H3 library is " + toString(MAX_H3_RES), ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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// Numerical constant is 180 degrees / pi / Earth radius, Earth radius is from h3 sources
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Float64 res = 8.99320592271288084e-6 * edgeLengthM(resolution);
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dst_data[row] = res;
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}
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block[result].column = std::move(dst);
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}
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};
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}
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void registerFunctionH3EdgeAngle(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3EdgeAngle>();
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}
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}
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