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https://issues.apache.org/jira/browse/PIG-2537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai updated PIG-2537:
----------------------------
Fix Version/s: (was: 0.10)
0.11
Discussed with Thejas, Alan, we might need to research more and find the best
way to solve the problem. Unlink from 0.10.
> 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: 0.11
>
> Attachments: PIG-2537-1.patch, PIG-2537-2.patch, PIG-2537-3.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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