Return the raw expressId column as the iteration source. The per-entity
loops already skip empty rows (if (!expressId) continue) so the
typed-array shape is correctness-safe AND lets the federated entry report
a total rather than streaming with total = -1.
Return the raw expressId column as the iteration source. The per-entity loops already skip empty rows (
if (!expressId) continue) so the typed-array shape is correctness-safe AND lets the federated entry report atotalrather than streaming withtotal = -1.