ClickHouse/src/Functions/h3GetResolution.cpp

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#if !defined(ARCADIA_BUILD)
# include "config_functions.h"
#endif
#if USE_H3
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#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Functions/IFunction.h>
#include <Common/typeid_cast.h>
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#include <common/range.h>
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#include <h3api.h>
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namespace DB
{
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namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
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namespace
{
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class FunctionH3GetResolution : public IFunction
{
public:
static constexpr auto name = "h3GetResolution";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3GetResolution>(); }
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std::string getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
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const auto * arg = arguments[0].get();
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if (!WhichDataType(arg).isUInt64())
throw Exception(
"Illegal type " + arg->getName() + " of argument " + std::to_string(1) + " of function " + getName() + ". Must be UInt64",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeUInt8>();
}
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_hindex = arguments[0].column.get();
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auto dst = ColumnVector<UInt8>::create();
auto & dst_data = dst->getData();
dst_data.resize(input_rows_count);
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for (const auto row : collections::range(0, input_rows_count))
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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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return dst;
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}
};
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}
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void registerFunctionH3GetResolution(FunctionFactory & factory)
{
factory.registerFunction<FunctionH3GetResolution>();
}
}
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#endif