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https://issues.apache.org/jira/browse/PIG-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616229#action_12616229
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Santhosh Srinivasan commented on PIG-320:
-----------------------------------------
The interface outputSchema in EvalFunc has remained unchanged from trunk. Prior
to submitting the patch, I tried to change the interface and found that it
broke a whole bunch of existing UDFs. There are two things that require a
change:
1. The outputSchema method should not take any inputs. It should be
outputSchema()
2. The return type of the method should be a FieldSchema and not a Schema
If we decide that these changes are required, I will go ahead and make these
changes.
> 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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