[GitHub] incubator-spark pull request: [Proposal] Adding sparse data suppor...

[mengxr]

Github user mengxr commented on the pull request:

    https://github.com/apache/incubator-spark/pull/575#issuecomment-35038739
  
    @fommil I don't quite understand what "roll their own" means exactly here. 
I didn't propose to re-implement one or half linear algebra library in the PR. 
For the license issue, it would be great if the original author of MTJ agrees 
to change the license to Apache. With the LGPL license, there is not much we 
can do.