Apache Spark reassigned SPARK-23568:

    Assignee:     (was: Apache Spark)

> Silhouette should get number of features from metadata if available
> -------------------------------------------------------------------
>                 Key: SPARK-23568
>                 URL: https://issues.apache.org/jira/browse/SPARK-23568
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 2.4.0
>            Reporter: Marco Gaido
>            Priority: Minor
> In Silhouette computation we need to know the number of features. This is 
> done taking the first row and checking the size of the features vector. 
> Despite it works fine, if the number of attributes is present in the metadata 
> of the column, we can avoid the additional job which is generated by using 
> `first`.

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