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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1315) [Zebra] Implementing OrderedLoadFunc interface for Zebra TableLoader
Date Thu, 25 Mar 2010 16:27:29 GMT

    [ https://issues.apache.org/jira/browse/PIG-1315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849753#action_12849753
] 

Xuefu Zhang commented on PIG-1315:
----------------------------------

This doesn't seem to make sense. The OrderedLoadFunc clearly asks the implementation to instantiate
any instance that conforms to WritableComparable interface, with which, I don't understand
why Pig needs to use reflection to instantiate Zebra objects. Ideally, all matters is the
interface and Pig shouldn't care how the underlying layer implements an interface or instantiate
an object. Am I missing anything here?

> [Zebra] Implementing OrderedLoadFunc interface for Zebra TableLoader
> --------------------------------------------------------------------
>
>                 Key: PIG-1315
>                 URL: https://issues.apache.org/jira/browse/PIG-1315
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>             Fix For: 0.8.0
>
>         Attachments: zebra.0324
>
>
> OrderedLoadFunc interface is used by Pig to do merge join and mapside cogrouping. For
Zebra, implementing this interface is necessary to support mapside cogrouping.

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