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https://issues.apache.org/jira/browse/MADLIB-947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15765436#comment-15765436
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Frank McQuillan commented on MADLIB-947:
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[~njayaram] In that case I would go with your suggestion to keep the current
PCA behavior and throw an error. The idea of ignoring other columns was just
a thought for usability, but I don't feel strongly about it. In fact, one
might argue that it is preferable to throw an error so that the user has to
explicitly set up the input table for PCA without superfluous columns.
> Support grouping for PCA
> ------------------------
>
> Key: MADLIB-947
> URL: https://issues.apache.org/jira/browse/MADLIB-947
> Project: Apache MADlib
> Issue Type: New Feature
> Reporter: Frank McQuillan
> Fix For: v1.10
>
>
> Implement grouping support in PCA
> http://doc.madlib.net/latest/group__grp__pca__train.html#train
> http://doc.madlib.net/latest/group__grp__pca__train.html#train
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