asdf2014 commented on issue #8728: Initial join support URL: https://github.com/apache/incubator-druid/issues/8728#issuecomment-546298943 Hi, @kstrempel . IMO, I don't think this is a problem on the same level. Presto does provide more richer SQL queries, but it does not store data itself, so there will be a process to ingest data from Druid, which will inevitably have some performance loss. And if Presto pushes most of the calculations down to Druid, then Druid still needs to have more SQL query capabilities, which is what the proposal is doing. I think this may be one of the reasons why Spark does not directly borrow the SQL features of Impala or Presto, but implement Spark SQL on its own.
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