Sean Owen commented on SPARK-10835:

[~yuhaoyan] just reviving this one because it came up on the list. I think it's 
of course straightforward to also change NGram, but it's also not going to 
actually output null arrays. It seems like we could have just fixed Word2Vec to 
not reject non-nullable array input types? or was the point that a similar 
problem would still exist for UDFs?

> Change Output of NGram to Array(String, True)
> ---------------------------------------------
>                 Key: SPARK-10835
>                 URL: https://issues.apache.org/jira/browse/SPARK-10835
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>            Reporter: Sumit Chawla
>            Assignee: yuhao yang
>            Priority: Minor
> Currently output type of NGram is Array(String, false), which is not 
> compatible with LDA  since their input type is Array(String, true). 

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