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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1330) Move pruned schema tracking logic from LoadFunc to core code
Date Mon, 05 Apr 2010 23:34:27 GMT

    [ https://issues.apache.org/jira/browse/PIG-1330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853600#action_12853600
] 

Pradeep Kamath commented on PIG-1330:
-------------------------------------

+1

> 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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