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12574dc8ec
The initial patch to use now() expressions during planner hypertable expansion only supported intervals with no day or month component. This patch adds support for intervals with day component. If the interval has a day component then the calculation needs to take into account daylight saving time switches and thereby a day would not always be exactly 24 hours. We mitigate this by adding a safety buffer to account for these dst switches when dealing with intervals with day component. These calculations will be repeated with exact values during execution. Since dst switches seem to range between -1 and 2 hours we set the safety buffer to 4 hours. This patch also refactors the tests since the previous tests made it hard to tell the feature was working after the constified values have been removed from the plans.