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101 lines
3.1 KiB
C++
101 lines
3.1 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/ColumnConst.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/IFunctionImpl.h>
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#include <Common/typeid_cast.h>
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#include <ext/range.h>
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#if __has_include(<h3/h3api.h>)
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# include <h3/h3api.h>
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#else
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# include <h3api.h>
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#endif
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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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/// 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(const Context &) { 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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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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auto arg = arguments[0].get();
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if (!WhichDataType(arg).isFloat64())
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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 Float64",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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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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"Illegal type " + arg->getName() + " of argument " + std::to_string(2) + " of function " + getName() + ". Must be Float64",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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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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"Illegal type " + arg->getName() + " of argument " + std::to_string(3) + " of function " + getName() + ". Must be UInt8",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeUInt64>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
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{
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const auto col_lon = block.getByPosition(arguments[0]).column.get();
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const auto col_lat = block.getByPosition(arguments[1]).column.get();
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const auto col_res = block.getByPosition(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 (const auto row : ext::range(0, input_rows_count))
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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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GeoCoord coord;
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coord.lon = degsToRads(lon);
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coord.lat = degsToRads(lat);
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H3Index hindex = geoToH3(&coord, res);
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dst_data[row] = hindex;
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}
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block.getByPosition(result).column = std::move(dst);
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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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