Github user oliverpierson commented on the pull request:
https://github.com/apache/spark/pull/11553#issuecomment-193920865
@thunterdb I like your suggestion. However, off the top of my head, I'm not
sure how to make a parameter default depend on another param. E.g.
```
setDefault(numBuckets, 2)
setDefault(relativeError -> min(0.1, 1.0 / (10 * $(numBuckets)))
```
would always return 0.05, even if you set `numBuckets` later on. Perhaps
lazy evaluation could be used, but that probably entails changing `setDefault`
to use call-by-name. Unless somebody knows of a good way of accomplishing
this, it might be best to just stick with 0.01 for this PR.
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