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https://issues.apache.org/jira/browse/CRUNCH-450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083166#comment-14083166
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Zhong Wang commented on CRUNCH-450:
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Hi Josh,
1) tupleDerived functions work as wrappers if there is only a single object to
serialize to OrcStruct (basic unit for orc serialization). The functions will
wrap the single object with a tuple, and use TupleObjectInspector to serialize
it to OrcStruct. Collections and maps are the same as other primitives except
that they need a real deep copier
2) I am not sure what you mean by executing a MapReduce job purely in OrcTypes.
We can combine different type families in a single MapReduce job, such as using
OrcTypes as input, Writables as shuffle and Avros as the output. The
OrcTypeFamily exists to serialize/deserialize java objects to/from OrcStructs
> Adding ORC file format support in Crunch
> ----------------------------------------
>
> Key: CRUNCH-450
> URL: https://issues.apache.org/jira/browse/CRUNCH-450
> Project: Crunch
> Issue Type: New Feature
> Components: Core, IO
> Reporter: Zhong Wang
> Assignee: Josh Wills
> Fix For: 0.11.0
>
> Attachments: CRUNCH-450-submodule.1.patch,
> CRUNCH-450-submodule.2.patch, CRUNCH-450-submodule.patch, CRUNCH-450.patch
>
>
> This JIRA adds ORC file format support in Crunch by:
> --
> 1. Adding input source and output target for ORC
> 2. Adding a new type family - OrcTypeFamily to serialize / deserialize
> objects into OrcStruct
> 3. Supporting column pruning optimization
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