presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/TransformCorrelatedInPredicateToJoin.java/DecorrelatingVisitor/DecorrelatingVisitor
class DecorrelatingVisitor:        public DecorrelatingVisitor(Lookup lookup, Iterable<Symbol> correlation)
        {
            this.lookup = requireNonNull(lookup, "lookup is null");
            this.correlation = ImmutableSet.copyOf(requireNonNull(correlation, "correlation is null"));
        }