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95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
#if !defined(ARCADIA_BUILD)
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# include "config_functions.h"
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#endif
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#if USE_H3
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#include <array>
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#include <math.h>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnTuple.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypeTuple.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 <Common/typeid_cast.h>
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#include <ext/range.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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}
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namespace
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{
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/// Implements the function h3ToGeo which takes a single argument (h3Index)
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/// and returns the longitude and latitude that correspond to the provided h3 index
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class FunctionH3ToGeo : public IFunction
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{
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public:
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static constexpr auto name = "h3ToGeo";
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static FunctionPtr create(ContextConstPtr) { return std::make_shared<FunctionH3ToGeo>(); }
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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).isUInt64())
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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 UInt64",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeTuple>(
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DataTypes{std::make_shared<DataTypeFloat64>(), std::make_shared<DataTypeFloat64>()},
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Strings{"longitude", "latitude"});
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto * col_index = arguments[0].column.get();
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ColumnPtr res_column;
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auto latitude = ColumnFloat64::create(input_rows_count);
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auto longitude = ColumnFloat64::create(input_rows_count);
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ColumnFloat64::Container & lon_data = longitude->getData();
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ColumnFloat64::Container & lat_data = latitude->getData();
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for (const auto row : ext::range(0, input_rows_count))
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{
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const UInt64 h3index = col_index->getUInt(row);
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GeoCoord coord;
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h3ToGeo(h3index,&coord);
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lon_data[row] = radsToDegs(coord.lon);
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lat_data[row] = radsToDegs(coord.lat);
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}
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MutableColumns result;
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result.emplace_back(std::move(longitude));
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result.emplace_back(std::move(latitude));
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return ColumnTuple::create(std::move(result));
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}
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};
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}
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void registerFunctionH3ToGeo(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3ToGeo>();
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}
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}
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#endif
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