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https://issues.apache.org/jira/browse/PIG-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019229#comment-13019229
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Laukik Chitnis commented on PIG-1788:
-------------------------------------
This issue seems to have been resolved as part of the parser overhaul in 0.9:
{noformat}
grunt> a = load 'a' as (x,y,z);
grunt> g = group a by y;
grunt> f = foreach g generate COUNT(g);
2011-04-13 06:25:15,619 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
0: <line 3, column 29> Invalid scalar projection: g
{noformat}
> 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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