LinearAlgebra remove unused export

[KristofferC]

Maybe we should CI that nothing exports undefined symbols?

[Jutho]

Is it actually useful to export all these factorization types. I don't think they are often constructed explicitly/directly in user code? I sometimes have a name clash while scripting, because I have a variable that is called QR (which has nothing to do with the QR).

[Jutho]

Bump. I assume this is not the right place to ask, but the questions seems to small to open a new issue or Discourse thread. Is it useful that all these types are exported? More generally, should the export list of the standard libraries be that what used to be exported by Julia Base, or the whole list that used to be exported in the corresponding submodules of Base back in the 0.6 days?

[fredrikekre]

Is it useful that all these types are exported?

Which ones are not useful?

More generally, should the export ...

Yea, I think it is ok for LinearAlgebra to export more stuff than what was reexported from Base, since it is required to using LinearAlgebra to make them visible in your module.

[Jutho]

Which ones are not useful?

My apologies if I was not clear; I meant the factorization types, i.e.

    Factorization,
    BunchKaufman,
    Cholesky,
    CholeskyPivoted,
    Eigen,
    GeneralizedEigen,
    GeneralizedSVD,
    GeneralizedSchur,
    Hessenberg,
    LU,
    LDLt,
    QR,
    QRPivoted,
    LQ,
    Schur,
    SVD,

I don't think these are ever directly called or constructed, but only arise as output of the corresponding lowercase functions. This is different from e.g. Symmetric or UppperTriangular which are directly called for construction, and should indeed definitely be exported.

[andreasnoack]

I think it would be fine not to export the factorization types. As you point out, normal users should never need to use them explicitly.