Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/9159#issuecomment-151042772
It looks well, but I curious about whether we can figure out a more elegant
way like this:
```scala
class BlockMatrix[M <: Matrix] @Since("1.3.0") (
@Since("1.3.0") val blocks: RDD[((Int, Int), M)],
@Since("1.3.0") val rowsPerBlock: Int,
@Since("1.3.0") val colsPerBlock: Int,
private var nRows: Long,
private var nCols: Long) extends DistributedMatrix with Logging {
}
```
Can we embrace all these cases together and make an unified constructor?
I'm not sure it can work, just a proposal. Please let me know if it's
unrealistic.
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