Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2294#issuecomment-55977479
Adding new methods to a trait is a break change. We can mark `Vector` and
`Matrix` as sealed, so no one can extend them. From Jenkins log:
~~~
[error] * method
transposeTimes(org.apache.spark.mllib.linalg.DenseVector)org.apache.spark.mllib.linalg.DenseVector
in trait org.apache.spark.mllib.linalg.Matrix does not have a correspondent in
old version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.transposeTimes")
[error] * method
transposeTimes(org.apache.spark.mllib.linalg.DenseMatrix)org.apache.spark.mllib.linalg.DenseMatrix
in trait org.apache.spark.mllib.linalg.Matrix does not have a correspondent in
old version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.transposeTimes")
[error] * method
times(org.apache.spark.mllib.linalg.DenseVector)org.apache.spark.mllib.linalg.DenseVector
in trait org.apache.spark.mllib.linalg.Matrix does not have a correspondent in
old version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.times")
[error] * method
times(org.apache.spark.mllib.linalg.DenseMatrix)org.apache.spark.mllib.linalg.DenseMatrix
in trait org.apache.spark.mllib.linalg.Matrix does not have a correspondent in
old version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.times")
[error] * method copy()org.apache.spark.mllib.linalg.Matrix in trait
org.apache.spark.mllib.linalg.Matrix does not have a correspondent in old
version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.copy")
~~~
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