robdiciuccio commented on issue #12766:
URL: https://github.com/apache/superset/issues/12766#issuecomment-768032725


   Hi @iercan, it is expected that the event polling mechanism makes continuous 
requests to the `/api/v1/async_event/` endpoint (presumably what's in the above 
screenshot). The `sqlalchemy.exc.NoSuchColumnError` trace you posted above 
appears to be a SQL query error against your analytics DB. Does the same query 
function correctly in synchronous mode?
   
   Also, not sure if you've seen this, but check out the documentation added 
here: https://github.com/apache/superset/pull/12573


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