gianm opened a new issue #7777: timestamp_ceil function is either wrong or misleading URL: https://github.com/apache/incubator-druid/issues/7777 ### Affected Version 0.14.2 ### Description `SELECT CEIL(TIMESTAMP '2000-01-01 00:00:00' TO DAY)` returns `2000-01-02T00:00:00.000Z`, but `2000-01-01T00:00:00.000Z` would make more sense. This happens because what `CEIL(<timestamp> TO Y)` does is return the (exclusive) upper bound of the time bucket that includes `<timestamp>`. In particular, because it's exclusive, it will never be equal to the timestamp. If you pass in something that is at the bottom end of a bucket then you'll get the start of the next bucket. The function doesn't seem to be standardized (at least I can't find docs on it as a standard SQL function anywhere) so I guess it can behave however we want. IMO the current behavior is a bit weird, since it's non-idempotent. So it would make more sense to special case it so it returns the provided timestamp if that timestamp is already the upper bound of a time bucket. Original discussion: https://groups.google.com/d/topic/druid-user/199ADDTT08Q/discussion
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