[jira] Commented: (HIVE-655) Add support for user defined table generating functions

["Namit Jain (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777294#action_12777294 ] 

Namit Jain commented on HIVE-655:
---------------------------------

Since it is a table function, I think we should limit its usage, i.e only 1 item can be present in the select clause.

SELECT explode(list1), EXPLODE(list2) FROM mytable; 
should throw an error instead of returning (list1, list2) pairs.

We can always do it via a sub-query.

select * from 
(SELECT explode(list1) from mytable)sq1  join (select * from EXPLODE(list2) FROM mytable) sq2; 


If need be, we can add it later in a follow-up jira

> 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
>
>
> 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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