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https://issues.apache.org/jira/browse/THRIFT-1833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300841#comment-16300841
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James E. King, III commented on THRIFT-1833:
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Your assessment looks correct - thanks for finding this.
> Thrift generates incorrect C++ writer for union
> -----------------------------------------------
>
> Key: THRIFT-1833
> URL: https://issues.apache.org/jira/browse/THRIFT-1833
> Project: Thrift
> Issue Type: Bug
> Components: C++ - Compiler
> Affects Versions: 0.9
> Reporter: Alan Choi
> Fix For: 0.11.0
>
> Attachments: Thrift-1833.diff
>
>
> The generated union struct c++ writer would write all union fields. This is
> incorrect. It should only write the field that has been set.
> It causes incompatibility between c++ and Java. A union written by C++ side
> cannot be read by the Java side.
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