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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (PIG-1321) Logical Optimizer: Merge cascading foreach
Date Tue, 22 Jun 2010 00:17:57 GMT

     [ https://issues.apache.org/jira/browse/PIG-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai reassigned PIG-1321:
-------------------------------

    Assignee: Xuefu Zhang  (was: Daniel Dai)

> Logical Optimizer: Merge cascading foreach
> ------------------------------------------
>
>                 Key: PIG-1321
>                 URL: https://issues.apache.org/jira/browse/PIG-1321
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Daniel Dai
>            Assignee: Xuefu Zhang
>
> We can merge consecutive foreach statement.
> Eg:
> b = foreach a generate a0#'key1' as b0, a0#'key2' as b1, a1;
> c = foreach b generate b0#'kk1', b0#'kk2', b1, a1;
> => c = foreach a generate a0#'key1'#'kk1', a0#'key1'#'kk2', a0#'key2', a1;

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