combination group by question

Hi, I have a question.

What strategy used when combinational dimension group by query executed.

For example, Elasticsearch use “depth-first” strategy prevent combination explosions.

(https://www.elastic.co/guide/en/elasticsearch/guide/current/_preventing_combinatorial_explosions.html)

thanks,

Jay

Hi Jay, with Druid, you don’t really need to think about combinatorial explosions or strategies for multi-dimensional groupBys. Just execute the groupBy (FWIW, you should always use groupBy v2).

– FJ