**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')))). 
```

{
    validateKeyTypes(key_types);
    const auto first_column = key_columns.front();
    const auto rows = first_column->size();
    if (first_column->isNumeric())
    {
        uint8_t addrv6_buf[IPV6_BINARY_LENGTH];
        for (const auto i : ext::range(0, rows))
        {
            auto addrv4 = UInt32(first_column->get64(i));
            auto found = tryLookupIPv4(addrv4, addrv6_buf);
            out[i] = (found != ipNotFound());
        }
    }
    else
    {
        for (const auto i : ext::range(0, rows))
        {
            auto addr = first_column->getDataAt(i);
            if (unlikely(addr.size != IPV6_BINARY_LENGTH))
                throw Exception("Expected key to be FixedString(16)", ErrorCodes::LOGICAL_ERROR);
            auto found = tryLookupIPv6(reinterpret_cast<const uint8_t *>(addr.data));
            out[i] = (found != ipNotFound());
        }
    }
    query_count.fetch_add(rows, std::memory_order_relaxed);
}
void IPAddressDictionary::createAttributes()