Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/296#issuecomment-39880128
Makes sense, although in practice users might do
`coordinateMatrix.toIndexedRowMatrix.covariance`. Do we want to change
CoordinateMatrix.toIndexedRowMatrix to add in the empty rows? You could just
union the data with `sc.parallelize(0 until numRows)` somehow to add entries
for those.
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