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From "Santhosh Srinivasan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-505) Lineage for UDFs that do not return bytearray
Date Thu, 30 Oct 2008 22:38:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Santhosh Srinivasan updated PIG-505:
------------------------------------

    Attachment: PIG-505.patch

The attached patch (PIG-505.patch) addresses the following issues:

1. The lineage code does not error out when bytearrays are seen from a UDF. Instead the error
message is pushed to runtime if a bytearray originating from a UDF is cast to a Pig type

2. Moved the SchemaUitils class out of the parser and into the Schema class

3. Added unit test cases for the lineage change

All unit test cases pass.

> Lineage for UDFs that do not return bytearray
> ---------------------------------------------
>
>                 Key: PIG-505
>                 URL: https://issues.apache.org/jira/browse/PIG-505
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Santhosh Srinivasan
>            Assignee: Santhosh Srinivasan
>             Fix For: types_branch
>
>         Attachments: PIG-505.patch
>
>
> In Pig-335, the lineage design states that UDFs that return bytearrays could cause problems
in tracing the lineage. For UDFs that do not return bytearray, the lineage design should pickup
the right load function to use as long as there is no ambiguity.  In the current implementation,
we could have issues with scripts like:
> {code}
> a = load 'input' as (field1);
> b = foreach a generate myudf_to_double(field1);
> c =  foreach b generate $0 + 2.0;
> {code}
> When $0 has to be cast to a double, the lineage code will complain that it hit a UDF
and hence cannot determine the right load function to use.

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