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https://issues.apache.org/jira/browse/PIG-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019378#comment-13019378
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Thejas M Nair commented on PIG-1788:
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The new error message still does not address 'issue 2' in description. It would
be good to have an explanation in the error message, of why the scalar
projection is invalid.
> 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
> Assignee: Laukik Chitnis
> 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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