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https://issues.apache.org/jira/browse/HIVE-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784597#action_12784597
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Paul Yang commented on HIVE-935:
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I recall in our meeting yesterday that having a GenericUDTF.forward() was
considered preferable to having GenericUDTF.process() return an array of
results because there were performance benefits. Namely, the GenericUDTF could
create a mutable object once, and then call GenericUDTF.forward() multiple
times on the same object.
However, the following LateralViewJoinOperator will need to hold all the
objects forwarded by the GenericUDTF for a given row before it can run the
crossproduct/join - which implies that the forwarded objects can't be the same.
Are there other reasons for having a separate GenericUDTF.forward()?
> support LATERAL VIEW
> --------------------
>
> Key: HIVE-935
> URL: https://issues.apache.org/jira/browse/HIVE-935
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Paul Yang
>
> For table functions, the following syntax should be supported
> select ... from T LATERAL VIEW explode(adid_list) as adid,...
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