Group by queries are never cached?

Hi all,
I found group by queries are never cached, because I have not seen any performance improve. But for time series queries I got a great improve if I opened cache. So can any one tell me the truth? Thanks!

By default, groupBy queries aren’t cached, although you can change that by editing druid.historical.cache.unCacheable (see http://druid.io/docs/latest/configuration/historical.html).

Got it. Thank you very much.

在 2017年9月1日星期五 UTC+8上午2:31:11,Gian Merlino写道:

By the way, I also want to know what behavior will be if I updating existing data on druid and post a query which will hit cache? On this situation, if druid get result from cache, the data should be incorrect. Does druid can handle this issue.

在 2017年9月1日星期五 UTC+8上午2:31:11,Gian Merlino写道:

The Druid cache is invalidated immediately when your data is updated, so it will never return stale results.

I see. Thanks.

在 2017年9月2日星期六 UTC+8上午2:26:29,Gian Merlino写道: