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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1434) Allow casting relations to scalars
Date Fri, 30 Jul 2010 05:29:17 GMT

    [ https://issues.apache.org/jira/browse/PIG-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893939#action_12893939
] 

Hadoop QA commented on PIG-1434:
--------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12450872/ScalarImplFinale.patch
  against trunk revision 980276.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated 1 warning messages.

    -1 javac.  The applied patch generated 146 javac compiler warnings (more than the trunk's
current 145 warnings).

    -1 findbugs.  The patch appears to introduce 5 new Findbugs warnings.

    -1 release audit.  The applied patch generated 406 release audit warnings (more than the
trunk's current 400 warnings).

    +1 core tests.  The patch passed core unit tests.

    -1 contrib tests.  The patch failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/366/testReport/
Release audit warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/366/artifact/trunk/patchprocess/releaseAuditDiffWarnings.txt
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/366/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/366/console

This message is automatically generated.

> Allow casting relations to scalars
> ----------------------------------
>
>                 Key: PIG-1434
>                 URL: https://issues.apache.org/jira/browse/PIG-1434
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>            Assignee: Aniket Mokashi
>             Fix For: 0.8.0
>
>         Attachments: scalarImpl.patch, ScalarImpl1.patch, ScalarImpl5.patch, ScalarImplFinale.patch
>
>
> This jira is to implement a simplified version of the functionality described in https://issues.apache.org/jira/browse/PIG-801.
> The proposal is to allow casting relations to scalar types in foreach.
> Example:
> A = load 'data' as (x, y, z);
> B = group A all;
> C = foreach B generate COUNT(A);
> .....
> X = ....
> Y = foreach X generate $1/(long) C;
> Couple of additional comments:
> (1) You can only cast relations including a single value or an error will be reported
> (2) Name resolution is needed since relation X might have field named C in which case
that field takes precedence.
> (3) Y will look for C closest to it.
> Implementation thoughts:
> The idea is to store C into a file and then convert it into scalar via a UDF. I believe
we already have a UDF that Ben Reed contributed for this purpose. Most of the work would be
to update the logical plan to
> (1) Store C
> (2) convert the cast to the UDF

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