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https://issues.apache.org/jira/browse/THRIFT-735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846018#action_12846018
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Bryan Duxbury commented on THRIFT-735:
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All unexpected enum values turn into null. In a list, that will lead to one or
more null instances in the list.
> Required field checking is broken when the field type is a Union struct
> -----------------------------------------------------------------------
>
> Key: THRIFT-735
> URL: https://issues.apache.org/jira/browse/THRIFT-735
> Project: Thrift
> Issue Type: Bug
> Components: Compiler (Java), Library (Java)
> Affects Versions: 0.2
> Reporter: Bryan Duxbury
> Assignee: Bryan Duxbury
> Fix For: 0.3
>
> Attachments: thrift-735.patch
>
>
> The validate() method on generated structs verifies that required fields are
> set after validation. However, if the type of the field is a Union struct,
> then just checking that the field isn't null is not a valid check. The value
> may be a non-null union, but have an unset field. (We encountered this when
> deserializing a type that had a union for a field, and the union's set value
> was an enum value that had been removed from the definition, making it a
> skip.)
> In order to perform the correct validation, if the value is a Union, then we
> must also check that the set field and value are non-null.
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