zhaojiandong commented on issue #6575: fix message gap error during index task warm-up URL: https://github.com/apache/incubator-druid/pull/6575#issuecomment-439698214 > Would it make sense to just emit nothing if there is no gap known? To me, that makes the most sense -- we don't know the value yet, so treat it like a null and don't emit it. > > @kaijianding, @zhaojiandong what do you think?  I thought about it carefully, there are two special periods: warning up period and window period. it's easy to report null at warming up period, but it's a little difficult to process at window period. I will rethink this issue. @gianm
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