Harish Butani created HIVE-4966:
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Summary: 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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