relation-as-scalar error messages should indicate the field being used as scalar
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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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