Druid metadata cannot be retrieved when the whole dataset has the same timestamp

[edevil]

My dataset has no notion of time, so when I ingested it into Druid I added a mock timestamp to all rows, as suggested in the tutorial (http://druid.io/docs/latest/tutorials/tutorial-batch.html).

Caravel tries to obtain the last segment of data for the druid metadata and works backwards from the max time. Since everything has the same date, no data is returned so no metadata is retrieved.

[optossav]

I've noticed the same issue with single day data sets.

[stale]

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