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https://issues.apache.org/jira/browse/CRUNCH-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083675#comment-16083675
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David Whiting commented on CRUNCH-650:
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Are you worried about transient deps or shapeless itself? There's only one
transient dependency on macro-compat, but shapeless itself could be awkward wrt
Scala version numbering, as we don't build different versions of Scrunch for
different versions of Scala. If we can somehow fix that, and do _2.10, _2.11
and _2.12 builds of scrunch then I think this is a safe addition, but without
that perhaps not.
> 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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