@Override
        public LogicalPlan apply(LogicalPlan plan) {
            return plan.resolveOperators(p -> {
                if (p instanceof UnresolvedRelation) {
                    return catalog.lookupRelation(((UnresolvedRelation) p).tableName());
                }
                return p;
            });
        }
Replaces [[UnresolvedRelation]]s with concrete relations from the catalog.
indexr-query-opt/src/main/java/io/indexr/query/Analyzer.java