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#include <Functions/FunctionFactory.h>
#include <Functions/GeoHash.h>
#include <Functions/FunctionHelpers.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnTuple.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypesNumber.h>
#include <string>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
namespace
{
// geohashDecode(string) => (lon float64, lat float64)
class FunctionGeohashDecode : public IFunction
{
public:
static constexpr auto name = "geohashDecode";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeohashDecode>(); }
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
validateArgumentType(*this, arguments, 0, isStringOrFixedString, "string or fixed string");
return std::make_shared<DataTypeTuple>(
DataTypes{std::make_shared<DataTypeFloat64>(), std::make_shared<DataTypeFloat64>()},
Strings{"longitude", "latitude"});
}
template <typename ColumnTypeEncoded>
bool tryExecute(const IColumn * encoded_column, ColumnPtr & result_column) const
{
const auto * encoded = checkAndGetColumn<ColumnTypeEncoded>(encoded_column);
if (!encoded)
return false;
const size_t count = encoded->size();
auto latitude = ColumnFloat64::create(count);
auto longitude = ColumnFloat64::create(count);
ColumnFloat64::Container & lon_data = longitude->getData();
ColumnFloat64::Container & lat_data = latitude->getData();
for (size_t i = 0; i < count; ++i)
{
std::string_view encoded_string = encoded->getDataAt(i).toView();
geohashDecode(encoded_string.data(), encoded_string.size(), &lon_data[i], &lat_data[i]);
}
MutableColumns result;
result.emplace_back(std::move(longitude));
result.emplace_back(std::move(latitude));
result_column = ColumnTuple::create(std::move(result));
return true;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const IColumn * encoded = arguments[0].column.get();
ColumnPtr res_column;
if (tryExecute<ColumnString>(encoded, res_column) ||
tryExecute<ColumnFixedString>(encoded, res_column))
return res_column;
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unsupported argument type:{} of argument of function {}",
arguments[0].column->getName(), getName());
}
};
}
REGISTER_FUNCTION(GeohashDecode)
{
factory.registerFunction<FunctionGeohashDecode>();
}
}
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