Suppose you use druid to store web tracking data (url).
Suppose also you assign one or more categories to each url in a mysql database.
What would be the best way to query druid on categories? I thought I would create a lookup that would give me a multi value dimension.
However, according to my tests, the lookup is a single value dimension. Am I right ?
note that according to documentation the “tsv lookupParseSpec” has a