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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10427) collect_list() and collect_set() should accept struct types as argument
Date Thu, 04 Jun 2015 23:26:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573788#comment-14573788
] 

Lefty Leverenz commented on HIVE-10427:
---------------------------------------

Doc note:  Adding TODOC2.0 label since this was committed to master today.  If it is also
committed to branch-1, please replace TODOC2.0 with TODOC1.3.

Documentation for collect_list() and collect_set() is in the UDAF section on the UDFs page:

* [Built-in Aggregate Functions (UDAF) | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-Built-inAggregateFunctions(UDAF)]

> collect_list() and collect_set() should accept struct types as argument
> -----------------------------------------------------------------------
>
>                 Key: HIVE-10427
>                 URL: https://issues.apache.org/jira/browse/HIVE-10427
>             Project: Hive
>          Issue Type: Wish
>          Components: UDF
>            Reporter: Alexander Behm
>            Assignee: Chao Sun
>              Labels: TODOC2.0
>         Attachments: HIVE-10427.1.patch, HIVE-10427.2.patch, HIVE-10427.3.patch, HIVE-10427.4.patch
>
>
> The collect_list() and collect_set() functions currently only accept scalar argument
types. It would be very useful if these functions could also accept struct argument types
for creating nested data from flat data.
> For example, suppose I wanted to create a nested customers/orders table from two flat
tables, customers and orders. Then it'd be very convenient to write something like this:
> {code}
> insert into table nested_customers_orders
> select c.*, collect_list(named_struct("oid", o.oid, "order_date": o.date...))
> from customers c inner join orders o on (c.cid = o.oid)
> group by c.cid
> {code}
> Thanks you for your consideration.



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