I currently use Apache IoTDB Version 0.13.3. When I tried to query the first and last value of data using group by, the aggregated data result returned is null, but I know that the data should not be null. I checked the same device, the aggregation data result came back normal when the time period is from November 2nd to November 3rd, but null appears in the aggregation result from November 1st to November 30th. This situation occurs indefinitely when different time ranges are selected. Is there any way to find out what may be the problem?
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