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https://issues.apache.org/jira/browse/CRUNCH-651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriel Reid updated CRUNCH-651:
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Fix Version/s: (was: 1.0.0)
> (WIP) Kotlin API for Crunch
> ---------------------------
>
> Key: CRUNCH-651
> URL: https://issues.apache.org/jira/browse/CRUNCH-651
> Project: Crunch
> Issue Type: Improvement
> Reporter: David Whiting
> Assignee: David Whiting
> Priority: Minor
> Attachments: 0001-WIP-Kotlin-API-for-Crunch.patch
>
>
> Motivation: Kotlin has recently gained a lot of popularity and people are
> really starting to talk about it and see its merits; and language-wise it
> should be perfect for writing data-transformation code as it has better
> support for functional programming and useful type stuff than Java, without
> the performance overhead and implicit mysteries of Scala.
> Attached is a patch for a proof-of-concept Kotlin API for Crunch. It makes
> heavy use of inlined functions so that the compiled bytecode ends up looking
> a lot like standard Crunch code (I ran it through a decompiler), and should
> be just as performant.
> It also uses reified type parameters to construct PTypes automatically from
> TypeReferences, so in most cases it's not necessary to provide a PType for
> transformations.
> See the example job and unit tests to get a quick idea of what kind of thing
> is possible.
> I've decided to share an unfinished patch with you all so that I can get some
> feedback if we think this is a useful addition to the Crunch project at all,
> and whether the general approach seems sensible.
> Still left TODO (if we decide to finish this and add it):
> * PGroupedTable API
> * Extensible PType inference (I'm thinking something like
> register<MyType>(pTypeForMyType))
> * Support for data classes via kotlin-reflect
> * Fill in any other gaps (mapWithContext, counters, ... ?)
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