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https://issues.apache.org/jira/browse/PIG-1758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012796#comment-13012796
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Dmitriy V. Ryaboy commented on PIG-1758:
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In other words, it's impossible to cast a bag of tuples of bytearrays into a
bag of tuples of longs without this patch.
It simply makes the POCast operator recurse into nested structures and keep
applying the caster as needed.
> Deep cast of complex type
> -------------------------
>
> Key: PIG-1758
> URL: https://issues.apache.org/jira/browse/PIG-1758
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Affects Versions: 0.8.0
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.9.0
>
> Attachments: PIG-1758-1.patch, PIG-1758-2.patch
>
>
> Pig does not handle deep cast from bag -> bag, tuple -> tuple. Eg, the
> following script does not produce desired result:
> {code}
> a = load '1.txt' as (a0:bag{t:tuple(i0:double)});
> b = foreach a generate (bag{tuple(int)})a0;
> dump b;
> {code}
> The result tuple still contain int inside tuple of bag.
> PIG-613 fix the case we cast bytearray -> bag/tuple, we take complex type
> including inner types, but bag->bag, tuple->tuple is still not effective.
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