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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1330) Move pruned schema tracking logic from LoadFunc to core code
Date Mon, 12 Apr 2010 19:11:53 GMT

     [ https://issues.apache.org/jira/browse/PIG-1330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-1330:
----------------------------

          Status: Resolved  (was: Patch Available)
    Hadoop Flags: [Reviewed]
      Resolution: Fixed

No unit test since this mostly a document change, no behavior will be changed for now, just
to be consistent as the code evolves. Committed to both 0.7 branch and trunk.

> Move pruned schema tracking logic from LoadFunc to core code
> ------------------------------------------------------------
>
>                 Key: PIG-1330
>                 URL: https://issues.apache.org/jira/browse/PIG-1330
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.7.0
>
>         Attachments: PIG-1330-1.patch
>
>
> Currently, LoadFunc.getSchema require a schema after column pruning. The good side of
this is LoadFunc.getSchema matches the data it actually load. This gives a sense of consistency.
However, by doing this, every LoadFunc need to keep track of the columns pruned. This is an
unnecessary burden to the LoadFunc writer and it is very error proning. This issue is to move
this logic from LoadFunc to Pig core. LoadFunc.getSchema then only need to return original
schema even after pruning.

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