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https://issues.apache.org/jira/browse/DRILL-362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910970#comment-13910970
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Jacques Nadeau commented on DRILL-362:
--------------------------------------

I don't think we need to change the proto files.  You could simply apply a 
filter to the proto files before generating your C code.  No reason to change 
the Java code since proto is a wire format.  

> Some protobuf enum values generates problematic C++/Windows code
> ----------------------------------------------------------------
>
>                 Key: DRILL-362
>                 URL: https://issues.apache.org/jira/browse/DRILL-362
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: George Chow
>            Priority: Minor
>
> The enums DataMode and MinorType (in Types.proto) each contain a value 
> (OPTIONAL and NULL respectively) that generate into problematic C++ code on 
> Windows under Visual Studio.
> I propose to add a prefix to the enum values to uniquify them. For example:
> enum DataMode {
>   DM_OPTIONAL = 0,
>   DM_REQUIRED = 1,
>   DM_REPEATED = 2
> }
> This is slightly ugly but is ultimately safe. Unfortunately, this change will 
> trigger a lot of little changes throughout the codebase.



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