presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/RemoveRedundantIdentityProjections.java/RemoveRedundantIdentityProjections/outputsSameAsSource
class RemoveRedundantIdentityProjections:    private static boolean outputsSameAsSource(ProjectNode node)
    {
        return ImmutableSet.copyOf(node.getOutputSymbols()).equals(ImmutableSet.copyOf(node.getSource().getOutputSymbols()));
    }