[jira] [Updated] (PIG-2537) Output from flatten with a null tuple input generating data inconsistent with the schema

["Daniel Dai (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai updated PIG-2537:
----------------------------

    Attachment: PIG-2537-1.patch
    
> Output from flatten with a null tuple input generating data inconsistent with the schema
> ----------------------------------------------------------------------------------------
>
>                 Key: PIG-2537
>                 URL: https://issues.apache.org/jira/browse/PIG-2537
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.8.0, 0.9.0
>            Reporter: Xuefu Zhang
>            Assignee: Daniel Dai
>             Fix For: 0.10
>
>         Attachments: PIG-2537-1.patch
>
>
> For the following pig script,
> grunt> A = load 'file' as ( a : tuple( x, y, z ), b, c );
> grunt> B = foreach A generate flatten( $0 ), b, c;
> grunt> describe B;
> B: {a::x: bytearray,a::y: bytearray,a::z: bytearray,b: bytearray,c: bytearray}
> Alias B has a clear schema.
> However, on the backend, for a row if $0 happens to be null, then output tuple become something like 
> (null, b_value, c_value), which is obviously inconsistent with the schema. The behaviour is confirmed by pig code inspection. 
> This inconsistency corrupts data because of position shifts. Expected output row should be something like
> (null, null, null, b_value, c_value).

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