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https://issues.apache.org/jira/browse/PIG-1046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828158#action_12828158
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Alan Gates commented on PIG-1046:
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-1. The original intent of the JIRA was to move from double quotes to single,
to match the rest of string usage in the language. Further discussion is
needed if we want to move these to identifiers instead.
> join algorithm specification is within double quotes
> ----------------------------------------------------
>
> Key: PIG-1046
> URL: https://issues.apache.org/jira/browse/PIG-1046
> Project: Pig
> Issue Type: Bug
> Reporter: Thejas M Nair
> Assignee: Ashutosh Chauhan
> Fix For: 0.7.0
>
> Attachments: pig-1046.patch
>
>
> This fails -
> j = join l1 by $0, l2 by $0 using 'skewed';
> This works -
> j = join l1 by $0, l2 by $0 using "skewed";
> String constants are single-quoted in pig-latin. If the algorithm
> specification is supposed to be a string, specifying it within single quotes
> should be supported.
> Alternatively, we should be using identifiers here, since these are
> pre-defined in pig users will not be specifying arbitrary values that might
> not be valid identifier.
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