gianm commented on pull request #10082:
URL: https://github.com/apache/druid/pull/10082#issuecomment-652576873


   > @gianm thanks for the review. As Travis is extremely slow recently, I'd 
like to address your last comments in a follow-up with doc for the known issue 
with response context not shared by subqueries.
   
   That works for me. I think the follow-ups we'd want before the next release 
would be:
   
   1. Add integration tests.
   2. Add the new error code to the documentation: 
https://github.com/apache/druid/pull/10082#discussion_r448525940
   3. Modify this method name: 
https://github.com/apache/druid/pull/10082#discussion_r448526783
   
   For documenting the limitations of response context, I'm actually not sure 
what we should do, because I realized that currently they aren't documented at 
all. They are a secret feature, I suppose. So I don't think there's any need to 
document their limitations if we aren't including it as a documented feature in 
the first place. I think there are two good options here:
   
   - Do nothing, don't add any docs.
   - Document response contexts as an 'alpha' or 'beta' level feature, and 
include documentation about their limitations (they can be too long and will 
either truncate or fail the query; and they aren't currently collected from all 
subqueries).


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