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https://issues.apache.org/jira/browse/HIVE-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655547#action_12655547
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Zheng Shao commented on HIVE-45:
--------------------------------
{code}
public abstract class UDFTemplate {
/**
* Evaluate the template function given the parameters row and rowInspector.
* NOTE: If the ObjectInspectors of the parameters do not change, then
result.oi cannot change as well.
* @param parameters the input parameters to the template function
* @param result result.o and result.oi will be set inside the method.
*/
public abstract void evaluate(List<InspectableObject> parameters,
InspectableObject result) throws HiveException;
/**
* Evaluate the result's ObjectInspector given the parameters'
ObjectInspectors.
* ObjectInspector encapsulates information about the object type and the
methods to access the internal fields inside the object.
* @param parameterInspectors the input parameters' ObjectInspectors to the
template function
* @return null if the template function does not accept such a list of
parameters; otherwise the same
* ObjectInspector as returned in result.oi in evaluate(...).
*/
public abstract ObjectInspector evaluateInspector(List<ObjectInspector>
parameterInspectors) throws HiveException;
}
{code}
> Hive: UDFTemplate and support of complex object
> -----------------------------------------------
>
> Key: HIVE-45
> URL: https://issues.apache.org/jira/browse/HIVE-45
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Zheng Shao
> Assignee: Zheng Shao
>
> We should allow users to define UDF template (in the sense of c++ template
> that can take args of different types), and let UDF take complex objects.
> This should be pretty simple given that we have the ObjectInspector which can
> navigate through the internal structure of the object.
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