presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/RemoveRedundantIdentityProjections.java/RemoveRedundantIdentityProjections/apply
class RemoveRedundantIdentityProjections:    @Override
    public Result apply(ProjectNode project, Captures captures, Context context)
    {
        return Result.ofPlanNode(project.getSource());
    }