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71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
#include "config_functions.h"
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#if USE_H3
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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 <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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class FunctionH3GetResolution : public IFunction
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{
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public:
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static constexpr auto name = "h3GetResolution";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3GetResolution>(); }
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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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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<DataTypeUInt8>();
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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_hindex = block.getByPosition(arguments[0]).column.get();
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auto dst = ColumnVector<UInt8>::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 UInt64 hindex = col_hindex->getUInt(row);
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UInt8 res = h3GetResolution(hindex);
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dst_data[row] = res;
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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 registerFunctionH3GetResolution(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionH3GetResolution>();
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}
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}
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#endif
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