Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/14156
@srowen
The := operator in BDM is simply copy one BDM to another, and it is widely
used in breeze source, e.g, we can check DenseMatrix.copy function in Breeze:
it first use `DenseMatrix.create` to create a new Matrix with the same
dimension
`val result = DenseMatrix.create(...)`
, and them use
`result := this` to copy self into the matrix just created.
The mechanism of := operator for DenseMatrix is that the DenseMatrix
implements the `OpSet` trait.
check `DenseMatrix` source file in breeze, in line 985, there is:
implicit val setMV_D:OpSet.InPlaceImpl2[...] = new SetDMDVOp[Double]()
so, the implementation code is in `SetDMDVOp` class
and we can see that in `SetDMDVOp` it do Type Specialization for Double
type so that the compiling code will have high efficiency.
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