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From "David Whiting (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-650) Support case classes and tuples without reflection or codegen using shapeless
Date Tue, 11 Jul 2017 11:46:00 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Whiting updated CRUNCH-650:
---------------------------------
    Attachment:     (was: 0001-Replace-generated-tuple-code-and-reflective-case-cla.patch)

> 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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