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collect_scanned_relation_ids

risingwave_frontend::optimizer::backfill_order_strategy::fixed

Function collect_scanned_relation_ids 

Source 
fn collect_scanned_relation_ids(
    session: &SessionImpl,
    plan: StreamPlanRef,
) -> HashMap<RelationId, HashSet<RelationId>>
Expand description

Collect a mapping from bindable relation IDs to relation IDs actually scanned in the plan.

Index selection may replace a scan on a base table with a scan on one of its index tables. In that case, both the base table ID and the index table ID map to the actual index table ID, so a user can still specify the base table in a fixed backfill order.