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https://issues.apache.org/jira/browse/THRIFT-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613742#action_12613742
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David Reiss commented on THRIFT-33:
-----------------------------------
Yes. That is why we ignore __isset in those cases: we don't want users to have
to maintain it manually.
> Unset fields will still be serialized if they are primitives
> ------------------------------------------------------------
>
> Key: THRIFT-33
> URL: https://issues.apache.org/jira/browse/THRIFT-33
> Project: Thrift
> Issue Type: Bug
> Components: Compiler (Java), Library (Java)
> Reporter: Bryan Duxbury
>
> Since primitive types (int, bool, byte, etc.) cannot be null in Java, the
> Java libraries will serialize "empty" values into their output. This is very
> bad when you have sparse Thrift structs with many possible fields and only
> one actually used.
> The Isset logic appears to be partially implemented, but is apparently
> unused. It seems like the required action is using getters and setters and
> honoring the isset information appropriately.
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