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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
#include "config.h"
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#if USE_H3
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#include <array>
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#include <cmath>
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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 <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 ILLEGAL_COLUMN;
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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(ContextPtr) { 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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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).isUInt64())
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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 UInt64",
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arg->getName(), 1, getName());
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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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auto non_const_arguments = arguments;
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for (auto & argument : non_const_arguments)
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argument.column = argument.column->convertToFullColumnIfConst();
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const auto * column = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
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if (!column)
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throw Exception(
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ErrorCodes::ILLEGAL_COLUMN,
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"Illegal type {} of argument {} of function {}. Must be UInt64.",
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arguments[0].type->getName(),
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1,
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getName());
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const auto & data = column->getData();
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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 (size_t row = 0; row < input_rows_count; ++row)
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{
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H3Index h3index = data[row];
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LatLng coord{};
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cellToLatLng(h3index,&coord);
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lon_data[row] = radsToDegs(coord.lng);
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lat_data[row] = radsToDegs(coord.lat);
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}
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MutableColumns columns;
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columns.emplace_back(std::move(longitude));
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columns.emplace_back(std::move(latitude));
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return ColumnTuple::create(std::move(columns));
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}
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};
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}
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REGISTER_FUNCTION(H3ToGeo)
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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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