use crate::observation::Observation;
use indexmap::IndexMap;
/// Groups observations by sample_id, preserving insertion order.
pub fn group_by_sample_id(
observations: impl Iterator<Item = Observation>,
) -> IndexMap<String, Vec<Observation>> {
let mut groups: IndexMap<String, Vec<Observation>> = IndexMap::new();
for obs in observations {
groups.entry(obs.sample_id.clone()).or_default().push(obs);
}
groups
}