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https://issues.apache.org/jira/browse/PIG-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616461#action_12616461
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Pi Song commented on PIG-320:
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EvalFunc interface is a bit confusing.
Let's wait for clarification from the mailing-list first.
> The parser/type checker should use the getSchema method of UDFs to deduce
> return type/schema
> --------------------------------------------------------------------------------------------
>
> Key: PIG-320
> URL: https://issues.apache.org/jira/browse/PIG-320
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: types_branch
> Reporter: Santhosh Srinivasan
> Assignee: Santhosh Srinivasan
> Fix For: types_branch
>
> Attachments: udf_outputSchema.patch
>
>
> Currently, the parser/type checker uses the getReturnType to deduce the
> return type of the user defined function (UDF). This mechanism is
> satisfactory only for basic types (int, long, ...); for composite types
> (tuple, bag), the schema is also required.The abstract class EvalFunc
> interface exposes the outputSchema to deduce the return type/schema of the
> UDF. The parser/type checker should use this method to figure out the return
> type/schema of the UDF and use it appropriately.
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