fn build_traj(
index: &dyn TemporalIndexAccess,
entity_id: u64,
filter: TemporalFilter,
) -> (Vec<(i64, u32)>, Vec<Vec<f32>>)fn build_traj(
index: &dyn TemporalIndexAccess,
entity_id: u64,
filter: TemporalFilter,
) -> (Vec<(i64, u32)>, Vec<Vec<f32>>)