Hive arg_max and arg_min
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Key: HIVE-888
URL: https://issues.apache.org/jira/browse/HIVE-888
Project: Hadoop Hive
Issue Type: New Feature
Reporter: Zheng Shao
We want a way to let Hive return the row with the maximum value of one field.
There are 2 approaches:
A1. Support arg_min and arg_max:
{code}
SELECT userid, ARG_MAX(action_time, action_type), ARG_MAX(action_time,
action_target) FROM userlog;
{code}
A2. Support struct<...> and let max, min take a struct and compare field by
field.
{code}
SELECT userid, MAX(struct(action_time:action_time, action_type:action_type,
action_target:action_target)) FROM userlog;
{code}
I think A2 should be easier to understand.
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