presto-main/src/main/java/io/prestosql/sql/planner/optimizations/UnaliasSymbolReferences.java/UnaliasSymbolReferences/visitRemoteSource
class UnaliasSymbolReferences:        @Override
        public PlanNode visitRemoteSource(RemoteSourceNode node, RewriteContext<Void> context)
        {
            return new RemoteSourceNode(
                    node.getId(),
                    node.getSourceFragmentIds(),
                    canonicalizeAndDistinct(node.getOutputSymbols()),
                    node.getOrderingScheme().map(this::canonicalizeAndDistinct),
                    node.getExchangeType());
        }