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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
#include "config_functions.h"
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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/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 <Common/typeid_cast.h>
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#include <base/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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extern const int INCORRECT_DATA;
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}
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namespace
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{
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/// Implements the function geoToH3 which takes 3 arguments (latitude, longitude and h3 resolution)
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/// and returns h3 index of this point
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class FunctionGeoToH3 : public IFunction
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{
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public:
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static constexpr auto name = "geoToH3";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeoToH3>(); }
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std::string getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 3; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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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).isFloat64())
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument {} of function {}. Must be Float64",
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arg->getName(), 1, getName());
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arg = arguments[1].get();
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if (!WhichDataType(arg).isFloat64())
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument {} of function {}. Must be Float64",
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arg->getName(), 2, getName());
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arg = arguments[2].get();
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if (!WhichDataType(arg).isUInt8())
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type {} of argument {} of function {}. Must be UInt8",
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arg->getName(), 3, getName());
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return std::make_shared<DataTypeUInt64>();
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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_lon = arguments[0].column.get();
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const auto * col_lat = arguments[1].column.get();
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const auto * col_res = arguments[2].column.get();
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auto dst = ColumnVector<UInt64>::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 (size_t row = 0; row < input_rows_count; ++row)
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{
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const double lon = col_lon->getFloat64(row);
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const double lat = col_lat->getFloat64(row);
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const UInt8 res = col_res->getUInt(row);
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LatLng coord;
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coord.lng = degsToRads(lon);
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coord.lat = degsToRads(lat);
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H3Index hindex;
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H3Error err = latLngToCell(&coord, res, &hindex);
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if (err)
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throw Exception(ErrorCodes::INCORRECT_DATA, "Incorrect coordinates latitude: {}, longitude: {}, error: {}", coord.lat, coord.lng, err);
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dst_data[row] = hindex;
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}
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return dst;
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}
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};
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}
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void registerFunctionGeoToH3(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionGeoToH3>();
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}
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}
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#endif
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