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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1788) relation-as-scalar error messages should indicate the field being used as scalar
Date Wed, 05 Jan 2011 20:57:46 GMT

    [ https://issues.apache.org/jira/browse/PIG-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977966#action_12977966
] 

Thejas M Nair commented on PIG-1788:
------------------------------------

It would be better to say 'relation used as scalar' instead of 'relation used in scalar context'
in above error messages.


> relation-as-scalar error messages should indicate the field being used as scalar
> --------------------------------------------------------------------------------
>
>                 Key: PIG-1788
>                 URL: https://issues.apache.org/jira/browse/PIG-1788
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Thejas M Nair
>             Fix For: 0.9.0
>
>
> Issue 1
> {code}
> grunt> l = load 'x' as (a,b,c);        
> grunt> g = group l by a;
> grunt> f = foreach g generate COUNT(g);       -- g is unintentionally being used as
scalar , the user intends it to be COUNT(l) . 
> 2011-01-05 12:44:53,098 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error
during parsing. Scalars can be only used with projections
> {code}
> Since the user did not intend to use a scalar, the scalar error messages are hard to
understand. 
> It will be useful to have the relation being used in scalar context in the error message.
Something like - "ERROR 1000: Error during parsing. Relation g being used in scalar context
at ... .Scalars can be only used with projections"
> Issue 2
> The error message "Scalars can be only used with projections" is not easy to understand.
A better error message is needed, something like "A column needs to be projected from relation
used in scalar context."

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