ExperimentalThe caller pinned the representation explicitly and the source can serve it.
Columnar is available and the caller's estimate reaches the columnar threshold.
Columnar is available but the estimated workload does not justify it.
Columnar is available but the caller supplied no estimate to justify it.
No columnar producer exists for this protocol.
The declared geometry encoding has no columnar producer.
Aggregate results are grouped rows, not a feature batch.
A columnar batch is a geometry batch; the query suppressed geometry.
Why the planner selected the representation it did. Every value is a deterministic function of declared source metadata plus QueryPlanningEstimates — never of result data.