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https://issues.apache.org/jira/browse/CRUNCH-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459644#comment-13459644
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Josh Wills commented on CRUNCH-71:
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+1.
> PType mapping functions are not initialized before being used for deep copying
> ------------------------------------------------------------------------------
>
> Key: CRUNCH-71
> URL: https://issues.apache.org/jira/browse/CRUNCH-71
> Project: Crunch
> Issue Type: Bug
> Affects Versions: 0.3.0
> Reporter: Gabriel Reid
> Assignee: Gabriel Reid
> Attachments: CRUNCH-71.patch
>
>
> The PType#getDetachedValue method performs a deep copy (if needed) in order
> to allow DoFns to hold on to values that have been passed through them (for
> example, in join functions).
> The WritablePType class uses the built-in input and output MapFns in the
> PType to handle this deep copying, but the input and output MapFns don't get
> initialized (i.e. initialize isn't called on them) after they are
> deserialized along with the DoFn that is using them. In some rare cases (at
> least for tuples), this can result in NullPointerExceptions or other
> nastiness.
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