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https://issues.apache.org/jira/browse/PIG-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570440#comment-13570440
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Alan Gates commented on PIG-3122:
---------------------------------
Reviewing this.
> Operators should not implicitly become reserved keywords
> --------------------------------------------------------
>
> Key: PIG-3122
> URL: https://issues.apache.org/jira/browse/PIG-3122
> Project: Pig
> Issue Type: Bug
> Reporter: Jonathan Coveney
> Assignee: Jonathan Coveney
> Fix For: 0.12
>
> Attachments: PIG-3122-0.patch
>
>
> As a byproduct of how ANTLR lexes things, whenever we introduce a new
> operator (RANK, CUBE, and any special keyword really) we are implicitly
> introducing a reserved word that can't be used for relations, columns, etc
> (unless give to us by the framework, as in the case of group).
> The following, for example, fails:
> {code}
> a = load 'foo' as (x:int);
> a = foreach a generate x as rank;
> {code}
> I'll include a patch to fix this essentially by whitelisting tokens. I
> currently just whitelist cube, rank, and group. We can add more as people
> want them? Can anyone think of reasonable ones they'd like to add?
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