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https://issues.apache.org/jira/browse/PIG-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444528#comment-13444528
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Dmitriy V. Ryaboy commented on PIG-2758:
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The two cases you called out are specifically documented as not supporting
complex types.
> Incomplete implementation in pig
> --------------------------------
>
> Key: PIG-2758
> URL: https://issues.apache.org/jira/browse/PIG-2758
> Project: Pig
> Issue Type: Bug
> Environment: All env
> Reporter: Mridul Muralidharan
>
> Support for Map's is not consistent in the builtin evalfunc/impl. There might
> be other inconsistencies too (like BIGCHARARRAY, but I have not investigated).
> For example: search for Long.class or Long.TYPE - this gives us the list of
> classes/usecases where "Map" is not supported the same way .. Invoker,
> MonitoredUDFExecutor.
> This is NOT a principled way to find all instances of this sort of buggy
> behavior - someone with better knowledge of pig internals (DataType's, other
> langs, checks, etc) can do a better job.
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