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Posted to issues@madlib.apache.org by "Frank McQuillan (JIRA)" <ji...@apache.org> on 2017/12/06 00:14:00 UTC

[jira] [Resolved] (MADLIB-1166) Correlation - do not drop whole row if a target column is NULL

     [ https://issues.apache.org/jira/browse/MADLIB-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Frank McQuillan resolved MADLIB-1166.
-------------------------------------
    Resolution: Fixed

> Correlation - do not drop whole row if a target column is NULL
> --------------------------------------------------------------
>
>                 Key: MADLIB-1166
>                 URL: https://issues.apache.org/jira/browse/MADLIB-1166
>             Project: Apache MADlib
>          Issue Type: Improvement
>          Components: Module: Descriptive Statistics
>            Reporter: Frank McQuillan
>            Priority: Minor
>             Fix For: v1.13
>
>
> http://madlib.apache.org/docs/latest/group__grp__correlation.html
> Current implementation ignores a row that contains NULL entirely. This means any correlation in such a row (with NULLs) does not contribute to the final answer.
> This improvement is not to drop the whole row if a target column is NULL, but rather to do pairwise correlation for any target columns that exist, to make most use of the data.



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