ClickHouse

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#include "config.h"
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#if USE_H3
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnTuple.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeTuple.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 <IO/WriteHelpers.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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class FunctionH3GetIndexesFromUnidirectionalEdge : public IFunction
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{
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public:
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    static constexpr auto name = "h3GetIndexesFromUnidirectionalEdge";
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    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3GetIndexesFromUnidirectionalEdge>(); }
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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 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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                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<DataTypeUInt64>(), std::make_shared<DataTypeUInt64>()},
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                Strings{"origin", "destination"});
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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 * col_hindex_edge = checkAndGetColumn<ColumnUInt64>(non_const_arguments[0].column.get());
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        if (!col_hindex_edge)
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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_hindex_edge = col_hindex_edge->getData();
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        auto origin = ColumnUInt64::create(input_rows_count);
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        auto destination = ColumnUInt64::create(input_rows_count);
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        ColumnUInt64::Container & origin_data = origin->getData();
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        ColumnUInt64::Container & destination_data = destination->getData();
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        for (size_t row = 0; row < input_rows_count; ++row)
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        {
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            const UInt64 edge = data_hindex_edge[row];
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            // allocate array of size 2
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            // directedEdgeToCells func sets the origin and
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            // destination at [0] and [1] of the input vector
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            std::array<H3Index, 2> res;
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            directedEdgeToCells(edge, res.data());
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            origin_data[row] = res[0];
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            destination_data[row] = res[1];
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        }
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        MutableColumns columns;
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        columns.emplace_back(std::move(origin));
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        columns.emplace_back(std::move(destination));
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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(H3GetIndexesFromUnidirectionalEdge)
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{
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    factory.registerFunction<FunctionH3GetIndexesFromUnidirectionalEdge>();
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}
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}
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#endif
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