Author: Jon Dart
Date: 12:34:39 07/08/02
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Your original post implied to me that you were asking about the benefits of recursive null pruning in general (vs. non-recursive pruning). I think it's pretty clear that this is a big win for many programs, although some still use no null pruning or a more restrictive version. If you're asking if R=2 is better than R=3 or R=2/3 (adaptive), I've tried adaptive null pruning from time to time (it's a compile-time switch in my program) and I always wind up going back to R=2 (recursive). Adaptive null pruning does a little worse on test suites, in my experience. But it seems that other programmers have had different experiences. --Jon
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