Method vector

src/Functions/geohashEncode.cpp:78–107

private:
    void vector(const IColumn * lon_column, const IColumn * lat_column, const IColumn * precision_column, ColumnPtr & result, size_t input_rows_count) const
    {
        auto col_str = ColumnString::create();
        ColumnString::Chars & out_vec = col_str->getChars();
        ColumnString::Offsets & out_offsets = col_str->getOffsets();

        out_offsets.resize(input_rows_count);
        out_vec.resize(input_rows_count * GEOHASH_MAX_TEXT_LENGTH);

        char * begin = reinterpret_cast<char *>(out_vec.data());
        char * pos = begin;

        for (size_t i = 0; i < input_rows_count; ++i)
        {
            const Float64 longitude_value = lon_column->getFloat64(i);
            const Float64 latitude_value = lat_column->getFloat64(i);
            const UInt64 precision_value = std::min<UInt64>(precision_column->get64(i), GEOHASH_MAX_TEXT_LENGTH);

            const size_t encoded_size = geohashEncode(longitude_value, latitude_value, static_cast<UInt8>(precision_value), pos);

            pos += encoded_size;
            out_offsets[i] = pos - begin;
        }
        out_vec.resize(pos - begin);

        if (!out_offsets.empty() && out_offsets.back() != out_vec.size())
            throw Exception(ErrorCodes::LOGICAL_ERROR, "Column size mismatch (internal logical error)");

        result = std::move(col_str);
    }
};

}