ClickHouse/src/Functions/s2ToGeo.cpp

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#include "config_functions.h"
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#if USE_S2_GEOMETRY
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#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnTuple.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeTuple.h>
#include <Functions/FunctionFactory.h>
#include <Common/typeid_cast.h>
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#include <base/range.h>
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#include "s2_fwd.h"
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class S2CellId;
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namespace DB
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{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int BAD_ARGUMENTS;
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}
namespace
{
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/**
* Returns a point (longitude, latitude) in degrees
*/
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class FunctionS2ToGeo : public IFunction
{
public:
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static constexpr auto name = "s2ToGeo";
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static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionS2ToGeo>();
}
std::string getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
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
{
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,
"Illegal type {} of argument {} of function {}. Must be Float64",
arg->getName(), 1, getName());
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DataTypePtr element = std::make_shared<DataTypeFloat64>();
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return std::make_shared<DataTypeTuple>(DataTypes{element, element});
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto * col_id = arguments[0].column.get();
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auto col_longitude = ColumnFloat64::create();
auto col_latitude = ColumnFloat64::create();
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auto & longitude = col_longitude->getData();
longitude.reserve(input_rows_count);
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auto & latitude = col_latitude->getData();
latitude.reserve(input_rows_count);
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for (const auto row : collections::range(0, input_rows_count))
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{
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const auto id = S2CellId(col_id->getUInt(row));
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if (!id.is_valid())
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Point is not valid");
S2Point point = id.ToPoint();
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S2LatLng ll(point);
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longitude.emplace_back(ll.lng().degrees());
latitude.emplace_back(ll.lat().degrees());
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}
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return ColumnTuple::create(Columns{std::move(col_longitude), std::move(col_latitude)});
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}
};
}
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void registerFunctionS2ToGeo(FunctionFactory & factory)
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{
factory.registerFunction<FunctionS2ToGeo>();
}
}
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#endif