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Date: Thu, 26 Dec 2013 11:11:50 +0000 (UTC)
From: "Chao Shi (JIRA)" <jira@apache.org>
To: crunch-dev@incubator.apache.org
Message-ID: <JIRA.12686401.1388056088935.11445.1388056310071@arcas>
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Subject: [jira] [Commented] (CRUNCH-315) Empty collection
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    [ https://issues.apache.org/jira/browse/CRUNCH-315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13856825#comment-13856825 ] 

Chao Shi commented on CRUNCH-315:
---------------------------------

A step further from empty PCollection: we can also add in-memory PCollection. A user can construct a small PCollection simply providing a java.util.Collection. I don't know if this is useful. Just write down here for completeness.

> Empty collection
> ----------------
>
>                 Key: CRUNCH-315
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-315
>             Project: Crunch
>          Issue Type: New Feature
>            Reporter: Chao Shi
>
> 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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