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https://issues.apache.org/jira/browse/HIVE-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777748#action_12777748
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Raghu Murthy commented on HIVE-655:
-----------------------------------
There was an alternate syntax to TRANSFORM.
FROM (
MAP columnlist USING mapscript AS newcolumnlist
FROM tablename ) a
REDUCE a.newcolumnlist USING reducescript
IIRC we later decided to just use TRANSORM for both map and reduce.
The lateral view syntax is more expressive. But I think it makes it
simpler to specify udtf in select clause if it's the only thing
specified, similar to transform.
> Add support for user defined table generating functions
> -------------------------------------------------------
>
> Key: HIVE-655
> URL: https://issues.apache.org/jira/browse/HIVE-655
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Raghotham Murthy
> Assignee: Paul Yang
> Attachments: HIVE-655.1.patch, HIVE-655.2.patch
>
>
> Provide a way for users to add a table generating function, i.e., functions
> that generate multiple rows from a single input row. Currently, the only way
> to do it is via the TRANSFORM clause which requires streaming the data.
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