Whether the current query is served by at least one synchronous source. False when the query is served only by asynchronous sources (e.g. a feed query served by the index), so callers can defer the initial subscription event until real results arrive instead of emitting an empty snapshot.
One-shot query.
Optionalopts: RunOptionsStart creating query sources and firing events.
start and stop are re-entrant.
Clear any resources associated with the query.
start and stop are re-entrant.
Set the filter and trigger continuous updates.
Query context for remote EDGE queries. Only supports one-shot queries (no reactive subscription).