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promql, tsdb (histograms): Do not re-use spans between histograms When multiple points exist with the same native histogram schemas they share their spans. This causes a problem when a native histogram (NH) schema is modified (for example, during a Sum) then the other NH's with the same spans are also modified. As such, we should create a new Span for each NH. This will ensure NH's interfaces are safe to use without considering the effect on other histograms. At the moment this doesn't present itself as a problem because in all aggregations and functions operating on native histograms they are copied by the promql query engine first. Signed-off-by: Joshua Hesketh <josh@nitrotech.org> --------- Signed-off-by: Joshua Hesketh <josh@nitrotech.org>