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https://issues.apache.org/jira/browse/HIVE-4966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725298#comment-13725298
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Carter Shanklin commented on HIVE-4966:
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Hi Harish,
I recently found need for a collect_array UDF that would maintain ordering and
duplicates. I actually just changed a few things out of collect_set. Do you
think that a collect_array would be generally useful? If so, would it make
sense to combine these into one UDAF to minimize code duplication?
> Introduce Collect_Map UDAF
> --------------------------
>
> Key: HIVE-4966
> URL: https://issues.apache.org/jira/browse/HIVE-4966
> Project: Hive
> Issue Type: Bug
> Reporter: Harish Butani
> Assignee: Harish Butani
>
> Similar to Collect_Set. For e.g. on a Txn table
> {noformat}
> Txn(customer, product, amt)
> select customer, collect_map(product, amt)
> from txn
> group by customer
> {noformat}
> Would give you an activity map for each customer.
> Other thoughts:
> - have explode do the inverse on maps just as it does for sets today.
> - introduce a table function that outputs each value as a column. So in the
> e.g. above you get an activity matrix instead of a map.
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