presto-main/src/main/java/io/prestosql/operator/OuterLookupSource.java/OuterPositionTracker/OuterPositionTracker
class OuterPositionTracker:        public OuterPositionTracker(Supplier<LookupSource> lookupSourceSupplier)
        {
            this.lookupSourceSupplier = lookupSourceSupplier;

            try (LookupSource lookupSource = lookupSourceSupplier.get()) {
                this.visitedPositions = new boolean[toIntExact(lookupSource.getJoinPositionCount())];
            }
        }