Lookup cache feature for multikey single value

Please any one explain me how lookup cache works in druid?

  1. It will only work on result set to replace a key with value using lookup cache.

  2. During scanning part how it will work?

  3. Is it possible to replace a value in druid query using lookupcache?


You can check the documentation here https://druid.apache.org/docs/latest/querying/lookups.html for how Lookups work in Druid. Druid does support performing lookups while scanning, pre/post aggregation. Lookup is meant to handle changing dimension values. If you are scanning, Druid will apply all matching lookup key and apply the corresponding values to each rows that are affected.

Rommel Garcia