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https://issues.apache.org/jira/browse/HIVE-699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao updated HIVE-699:
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Attachment: HIVE-699.1.patch
This patch does the trick. As a side effect, UDAF can take complex arguments
and return complex values - Hive will convert the object to the corresponding
Java Class on the fly.
This patch also includes an example UDAF (average) that uses a static inner
class with 2 fields: mCount and mSum to store the internal state. The
terminatePartial function just returns an object of this inner class, and Hive
is capable of reading the value out using reflection ObjectInspector. Then in
the reducer, Hive converts a struct with these 2 fields into an object of this
inner class by using the ReflectionStructObjectInspector(which implements
SettableStructObjectInspector).
> Make lots of existing ObjectInspectors settable
> -----------------------------------------------
>
> Key: HIVE-699
> URL: https://issues.apache.org/jira/browse/HIVE-699
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: HIVE-699.1.patch
>
>
> We should make JavaObjectInspectors, StandardList/Struct/MapObjectInspector,
> ReflectionObjectInspectors settable.
> This will allow us to make it possible to *write* into Thrift tables, as well
> as ProtocolBuffer tables in the future.
> This will also allow us to pass complex objects into UDF and receive complex
> objects from UDF by using ObjectInspectorConverters.
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