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#include "clickhouse_config.h"
#if USE_H3
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Functions/GatherUtils/GatherUtils.h>
#include <Functions/GatherUtils/Sources.h>
#include <Functions/IFunction.h>
#include <Common/typeid_cast.h>
#include <h3api.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
namespace
{
using namespace GatherUtils;
class FunctionStringToH3 : public IFunction
{
public:
static constexpr auto name = "stringToH3";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringToH3>(); }
std::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
{
const auto * arg = arguments[0].get();
if (!WhichDataType(arg).isStringOrFixedString())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument {} of function {}. "
"Must be String or FixedString", arg->getName(), std::to_string(1), getName());
return std::make_shared<DataTypeUInt64>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto * col_hindex = arguments[0].column.get();
auto dst = ColumnVector<UInt64>::create();
auto & dst_data = dst->getData();
dst_data.resize(input_rows_count);
if (const auto * h3index = checkAndGetColumn<ColumnString>(col_hindex))
execute<StringSource>(StringSource(*h3index), dst_data);
else if (const auto * h3index_fixed = checkAndGetColumn<ColumnFixedString>(col_hindex))
execute<FixedStringSource>(FixedStringSource(*h3index_fixed), dst_data);
else if (const ColumnConst * h3index_const = checkAndGetColumnConst<ColumnString>(col_hindex))
execute<ConstSource<StringSource>>(ConstSource<StringSource>(*h3index_const), dst_data);
else if (const ColumnConst * h3index_const_fixed = checkAndGetColumnConst<ColumnFixedString>(col_hindex))
execute<ConstSource<FixedStringSource>>(ConstSource<FixedStringSource>(*h3index_const_fixed), dst_data);
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column as argument of function {}", getName());
return dst;
}
private:
template <typename H3IndexSource>
static void execute(H3IndexSource h3index_source, PaddedPODArray<UInt64> & res_data)
{
size_t row_num = 0;
while (!h3index_source.isEnd())
{
auto h3index = h3index_source.getWhole();
// convert to std::string and get the c_str to have the delimiting \0 at the end.
auto h3index_str = std::string(reinterpret_cast<const char *>(h3index.data), h3index.size);
res_data[row_num] = stringToH3(h3index_str.c_str());
if (res_data[row_num] == 0)
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Invalid H3 index: {}", h3index_str);
}
h3index_source.next();
++row_num;
}
}
};
}
REGISTER_FUNCTION(StringToH3)
{
factory.registerFunction<FunctionStringToH3>();
}
}
#endif
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