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From "Micah Whitacre (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-239) Add support for unions of PTypes
Date Wed, 08 Jan 2014 13:49:51 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865438#comment-13865438
] 

Micah Whitacre commented on CRUNCH-239:
---------------------------------------

My current train of thought is that if Union doesn't implement Tuple then you don't have to
implement methods like size() which return an awkward value or implement a method that most
people will not really use.  So it is not really cognitive overhead but simplification.

> Add support for unions of PTypes
> --------------------------------
>
>                 Key: CRUNCH-239
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-239
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>         Attachments: CRUNCH-239.patch
>
>
> There are a few core use cases (e.g., cogroups, as in CRUNCH-174) where it would be useful
to construct a union of multiple PTypes into a single PType, where any given observation could
only be of one of multiple/optional types.



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