**Use case**
I'm using `ip_trie` on maxmind geoip databases. Given an IP address I want to find out what key was used (ie what network the IP comes under). But it seems it is not possible to look up the key field when using `dictGet`?

```
        <layout>
            <ip_trie/>
        </layout>
        <structure>
            <key>
                <attribute>
                    <name>network</name>
                    <type>String</type>
                </attribute>
            </key>
            <attribute>
                <name>geoname_id</name>
                <type>UInt32</type>
                <null_value>0</null_value>
            </attribute>
...
```

```
clickhouse :) select dictGet('geoip_city_blocks_ipv4', 'geoname_id', tuple(toUInt32(toIPv4('1.1.1.1')))) ;

┌─dictGet('geoip_city_blocks_ipv4', 'geoname_id', tuple(toUInt32(toIPv4('1.1.1.1'))))─┐
│                                                                             2077456 │
└─────────────────────────────────────────────────────────────────────────────────────┘

clickhouse :) select dictGet('geoip_city_blocks_ipv4', 'network', tuple(toUInt32(toIPv4('1.1.1.1')))) ;

Received exception from server (version 20.11.3):
Code: 36. DB::Exception: Received from localhost:9000. DB::Exception: No such attribute 'network': While processing dictGet('geoip_city_blocks_ipv4', 'network', tuple(toUInt32(toIPv4('1.1.1.1')))). 
```

{
    if (row_idx.empty())
        return ipNotFound();
    const auto * ipv4or6_col = std::get_if<IPContainerType>(&ip_column);
    if (ipv4or6_col == nullptr)
        return ipNotFound();
    auto comp = [&](auto value, auto idx) -> bool
    {
        if constexpr (std::is_same_v<IPContainerType, IPv4Container>)
            return value < (*ipv4or6_col)[idx];
        else
            return memcmp16(value, getIPv6FromOffset(*ipv4or6_col, idx)) < 0;
    };
    auto range = ext::range(0, row_idx.size());
    auto found_it = std::upper_bound(range.begin(), range.end(), target, comp);
    if (found_it == range.begin())
        return ipNotFound();
    --found_it;
    if constexpr (std::is_same_v<IPContainerType, IPv4Container>)
    {
        for (auto idx = *found_it;; idx = parent_subnet[idx])
        {
            if (matchIPv4Subnet(target, (*ipv4or6_col)[idx], mask_column[idx]))
                return row_idx.begin() + idx;
            if (idx == parent_subnet[idx])
                return ipNotFound();
        }
    }
    else
    {