fn reconcile_series_buckets(
buckets: Vec<SeriesBucket>,
index_buckets: &BTreeMap<Timestamp, IndexBucket>,
) -> Vec<SeriesBucket>Expand description
Expands SST buckets through existing index coverage before grouping build inputs.
buckets must be sorted by start and disjoint. index_buckets must contain
disjoint intervals keyed by their starts. Expansion preserves start ordering,
but may introduce overlaps, which are merged in the returned disjoint buckets.
Established index coverage is borrowed so deferred builds cannot modify it.