Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-50045370
@dbtsai As discussed with @srowen , the `%` sign is not helpful because we
need `0.00000000000001%` in many cases and people never use notations like
`1e-10%`.
Instead of adding more sugar in testing, how about using `absErr`/`absTol`
and `relErr`/`relTol`? For example,
~~~
assert(a ~== b absErr 0.01)
assert(a ~== b relTol 1e-5)
~~~
I still recommend using `err`/`tol` that switches automatically between
absolute error and relative error at `1.0`. But it is fine to be explicit.
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