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https://issues.apache.org/jira/browse/THRIFT-4005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746428#comment-15746428
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Isaac Sheff commented on THRIFT-4005:
-------------------------------------

At the moment, I intend to play with potential solutions at 
https://github.com/isheff/thrift/tree/THRIFT-4005 , but of course I can make no 
guarantees on my competence.

> Better Haskell Support for Union Types in Thrift
> ------------------------------------------------
>
>                 Key: THRIFT-4005
>                 URL: https://issues.apache.org/jira/browse/THRIFT-4005
>             Project: Thrift
>          Issue Type: Improvement
>          Components: Haskell - Compiler, Haskell - Library
>    Affects Versions: 1.0
>            Reporter: Isaac Sheff
>            Priority: Minor
>              Labels: features
>             Fix For: 1.0
>
>   Original Estimate: 1m
>  Remaining Estimate: 1m
>
> Thrift's Haskell implementation presently expresses union types as product 
> types. While this is sufficient for functionality, and may mirror the way 
> Thrift works under the hood, it requires the programmer to write unnecessary 
> runtime checks and matches to find the filled field, and verify there is 
> precisely one. 
> I propose augmenting the existing Haskell Thrift system with union Haskell 
> types for union Thrift types, and augmenting the interface definitions so the 
> user can define a service in terms of either the legacy product types or the 
> new union types.



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