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https://issues.apache.org/jira/browse/CRUNCH-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089291#comment-16089291
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Josh Wills commented on CRUNCH-650:
-----------------------------------
Mostly shapeless itself, but I'm not super-familiar with it's use across the
different versions of Scala. Is there a "safe" version that we can depend on
across versions, or for a specific version? I do not question that the current
approach is janky af and needs to be replaced.
> Support case classes and tuples without reflection or codegen using shapeless
> -----------------------------------------------------------------------------
>
> Key: CRUNCH-650
> URL: https://issues.apache.org/jira/browse/CRUNCH-650
> Project: Crunch
> Issue Type: Improvement
> Components: Scrunch
> Reporter: David Whiting
> Assignee: David Whiting
> Attachments:
> 0001-Replace-generated-tuple-code-and-reflective-case-cla.patch
>
>
> Scrunch support for case classes is pretty buggy, only supports a subset of
> scala versions, and fails at runtime instead of compile time if something
> goes wrong. Additionally, the support of tuple types via code generation is
> awkward and unnecessary.
> This patch should hopefully solve both of these with a shapeless
> (https://github.com/milessabin/shapeless) based solution which should be much
> simpler and more reliable, by defining a mechanism for deriving PTypeH
> instances for HLists where PTypeH instances for each type in the list is
> known.
> We have used it in a few production cases at SC for a while, and the unit and
> integration test suite passes, but I didn't write any new tests specifically
> for this purpose. Hopefully they should be covered by the existing tests
> using case classes and tuples.
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