[jira] [Resolved] (CRUNCH-315) Empty collection

["Josh Wills (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CRUNCH-315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Wills resolved CRUNCH-315.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.8.3
                   0.10.0

Pushed to master.

I'm inclined to say we add support for it only if/when someone brings a compelling use case for it, primarily because it's not a totally trivial change and (as Micah indicated) there are other mechanisms in place to do it when it's necessary.

> Empty collection
> ----------------
>
>                 Key: CRUNCH-315
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-315
>             Project: Crunch
>          Issue Type: New Feature
>            Reporter: Chao Shi
>             Fix For: 0.10.0, 0.8.3
>
>         Attachments: CRUNCH-315.patch
>
>
> As discussed in the mailing list [1] and [2], I'd like to add an empty collection feature. On the API side, I think we can add a new method in Pipeline to create an empty collection. The collection should be a subclass of PCollection and behaves like other normal PCollecitons. There are also some optimization points that Josh mentioned in [2].
> I haven't thought it clearly. Just put a ticket here and see if anyone else has a better idea.
> [1] http://mail-archives.apache.org/mod_mbox/crunch-dev/201312.mbox/%3CBLU0-SMTP1337A04FAC6B5F497F7473EADC10%40phx.gbl%3E
> [2] http://mail-archives.apache.org/mod_mbox/crunch-dev/201312.mbox/%3CCAH29n6MbSK9gapoC2DgVnhofjAobyasCuZh_0475DuSajV%3DCPg%40mail.gmail.com%3E



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