gianm commented on issue #7087: Online aggregation / Interactive Query Session Protocol URL: https://github.com/apache/incubator-druid/issues/7087#issuecomment-465309153 > I think this is why the online aggregation hasn't been implemented in any production systems even though it's been almost 20 years since it was introduced. I think not quite true. Splunk does something like this. I couldn't find documentation on it, but I think the feature is called a "preview". It can show time charts and tables that sort of bounce around until they're done being computed, and at that point a checkmark is shown. I found it useful for search results, but annoying for aggregations (since the previewed results can easily be misleading, like a time chart in a totally different shape from how it will end up being).
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