Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/6213#issuecomment-104936678
Internally vector flow in IndexedRowMatrix has helped us to do additional
optimization through user defined kernels and cut the computation which won't
happen if we go to dgemv since the matrix compute will be done first before
filters based on norm can be applied...I think we should keep the vector based
kernel compute and get user feedback first...
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