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https://github.com/yahoo/maha/tree/master/druid-lookups#maha-druid-lookups Maha lookup supports the multi value lookup.

Normally , https://druid.apache.org/docs/latest/querying/datasource.html#lookup Lookup datasources are key-value oriented and always have exactly two columns:

k

(the key) and

v

(the value), and both are always strings.

if you are using the lookups that ship with Druid you would need 3 lookups, user_id => gender, user_id => age, user_id => city