Fix native histogram data loss in split_by_interval merge due to broken minTime() sort#7555
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…ordering for split_by_interval merge Signed-off-by: Paurush Garg <paurushg@amazon.com>
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…ordering for split_by_interval merge
What this PR does:
Fixes minTime() in pkg/querier/tripperware/merge.go to handle native histogram-only responses when sorting sub-interval responses before merging.
When split_by_interval splits a range query and merges the results, MergeResponse sorts responses by minTime() to ensure chronological order before the dedup/merge logic runs. However, minTime() only checked SampleStream.Samples[0] — for native histogram queries like sum(rate(nh_metric[20m])), the result is a FloatHistogram stored in SampleStream.Histograms with Samples empty. This caused minTime() to return -1 for all sub-interval responses.
Tests
Added TestMinTime covering: empty matrix, float-only, histogram-only, both, and empty stream cases.
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]docs/configuration/v1-guarantees.mdupdated if this PR introduces experimental flags