Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-50064963
@mengxr `%+-` is used as an operator to indicate this is relative error.
Users can write `assert(a ~== b %+- 1E-10)` for relative error, and `assert(a
~== b +- 1E-10)` for absolute error.
As a result, the syntactic sugar would be the same as scalatest for
absolute error except they use `===` instead of `~==`.
On the other hand, however, using `absErr`/`relErr` seems to be easier to
remember. I'm open to both, and it's easy to change.
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