Songxiao Zhang issues

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                                            Songxiao Zhang

Propose to add a double[][] convenience method to convert back from DMatrixRMaj

`DMatrixRMaj` can be converted from a double-dimensional array (`doulbe[][]`) but not the other way around. Can we natively provide an interface for easier testing? To be more specific, a `DMatrixRMaj`...

Feature Request

a typo

btw, doesn't work for ssh remote server (CentOS)

Create a comparator utility to compare 2 parquet files and give a clear message for the differences

### Describe the usage question you have. Please include as many useful details as possible. We have been using Parquet files in production and would like an automated process for...