A peephole optimization: if someone requesting a tuple of attributes from a dictionary and immediately takes only one, don't request others.

**Use case**

```
dictGet(
        'ip_trie',
        ('country_code', 'latitude', 'longitude'),
        tuple(ip)
    ).1 as country,
```

Motivation: https://clickhouse.com/blog/geolocating-ips-in-clickhouse-and-grafana
