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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-159) Make changes to the parser to support new types functionality
Date Thu, 15 May 2008 18:09:55 GMT

    [ https://issues.apache.org/jira/browse/PIG-159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597210#action_12597210
] 

Alan Gates commented on PIG-159:
--------------------------------

A question on parser_changes_v6.patch.  You added DEFINE as a keyword to the pig parser. 
But it is still a keyword in the grunt parser (tools/pigscript/parser/PigScriptParser.jj).
 So I think grunt will still intercept the command and not pass it on to QueryParser.

> Make changes to the parser to support new types functionality
> -------------------------------------------------------------
>
>                 Key: PIG-159
>                 URL: https://issues.apache.org/jira/browse/PIG-159
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: parser_chages_v5.patch, parser_chages_v6.patch
>
>
> In order to support the new types functionality described in http://wiki.apache.org/pig/PigTypesFunctionalSpec,
the parse needs to change in the following ways:
> 1) AS needs to support types in addition to aliases.  So where previously it was legal
to say:
> a = load 'myfile' as a, b, c;
> it will now also be legal to say
> a = load 'myfile' as a integer, b float, c chararray;
> 2) Non string constants need to be supported.  This includes non-string atomic types
(integer, long, float, double) and the non-atomic types bags, tuples, and maps.
> 3) A cast operator needs to be added so that fields can be explicitly casted.
> 4) Changes to DEFINE, to allow users to declare arguments and return types for UDFs

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