Fabian Reinartz e561c91d53 Implement proper buffered iterator ... This adds a proper duration based lookback buffer for series iterators to allow advancing sequentially while remaining able to calculate time aggregating functions such as `rate` backwards. It uses an array ring buffer to minimize heap allocations for potentially hundreds of thousands of series for a single query.		2016-12-14 21:14:44 +01:00
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tsdb	Implement proper buffered iterator	2016-12-14 21:14:44 +01:00