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Posted to dev@pig.apache.org by "Santhosh Srinivasan (JIRA)" <ji...@apache.org> on 2008/05/13 20:35:55 UTC
[jira] Updated: (PIG-159) Make changes to the parser to support new
types functionality
[ https://issues.apache.org/jira/browse/PIG-159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Santhosh Srinivasan updated PIG-159:
------------------------------------
Attachment: parser_chages_v5.patch
This patch contains the following:
1. Type information in the schemas for AS
2. The expression operators return a field schema instead of a schema
3. LOUnion getSchema method uses the schema merge method
Note:
1. bag{} represents a bag of unkown
2.Add test case for checking conflicting aliases in LOGenerate
> 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
>
>
> 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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