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