Function isAggregate

src/runtime/builder.ts:566–574

(scan)

//-----------------------------------------------------------

function isAggregate(scan) {
  if(scan instanceof Aggregate ||
     scan instanceof Sort ||
     scan.hasAggregate ||
     (scan.strata && scan.strata.length > 1)) {
    return true;
  }
  return false;
}

function stratify(scans) {
  if(!scans.length) return [new BlockStratum([], [])];