[jira] Updated: (PIG-463) Strings (or other typed data) stored in maps cause problems with implicit casts in operations

["Pradeep Kamath (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pradeep Kamath updated PIG-463:
-------------------------------

    Attachment: PIG-463.patch

Attached patch - augments TestPOCast to test for the fix. 
TestJobSubmission and TestLocalJobSubmission unit tests fail but were failing even before the patch on the current code in svn and are not due to the patch

> Strings (or other typed data) stored in maps cause problems with implicit casts in operations
> ---------------------------------------------------------------------------------------------
>
>                 Key: PIG-463
>                 URL: https://issues.apache.org/jira/browse/PIG-463
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: PIG-463.patch
>
>
> If a map in pig (say returned from a UDF) has a key with the value being a string, then a lookup of that key being used in a context which expects a string will cause an implicit cast to a string. This is because the Pig frontented (logical layer) thinks of all map "values" as bytearrays and hence introduces a Cast to convert the bytearray to string. The POCast class then assumes its input is a DataByteArray and first tries to cast its input to DataByteArray. This fails because the object in the input to the case which is the value in the map is in fact already a string. So in these cases, we should not try to cast but just return the input object in the POCast.

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