Add order-sensitive and order-insensitive hashing aggregation functions (UDAF)
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Key: HIVE-357
URL: https://issues.apache.org/jira/browse/HIVE-357
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Zheng Shao
Assignee: Zheng Shao
In order to test whether a new version of Hive produces exactly the same result
as an order version, we usually want to run a bunch of big queries as well as
small queries.
It's hard to compare the result of big queries, but if we have a hashing
aggregation function, we can just aggregate the result of big queries and
compare the single number.
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