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When users want to query results from IQ, they need to know the start time of the window to get results. For most users it will be windowSize+the time they're looking at, since windows are defined backwards in SlidingWindows. For example, if there's an incident at 9:15am and they have a window size of 10 minutes, they're looking for a window with the start time of 108:15. If they don't have the exact time, they can use a range query and traverse through the results to get the one they're looking for. After KIP-617, users will be able to traverse backwards through their range query, making accessing the latest window simpler.
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