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From "Zhong Wang (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-450) Adding ORC file format support in Crunch
Date Fri, 01 Aug 2014 23:21:39 GMT


Zhong Wang commented on CRUNCH-450:

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:
>             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,
> 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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