[UDAF] implement GROUP_CONCAT(expr)
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Key: HIVE-650
URL: https://issues.apache.org/jira/browse/HIVE-650
Project: Hadoop Hive
Issue Type: New Feature
Reporter: Min Zhou
It's a very useful udaf for us.
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
GROUP_CONCAT(expr)
This function returns a string result with the concatenated non-NULL values
from a group. It returns NULL if there are no non-NULL values. The full syntax
is as follows:
GROUP_CONCAT([DISTINCT] expr [,expr ...]
[ORDER BY {unsigned_integer | col_name | expr}
[ASC | DESC] [,col_name ...]]
[SEPARATOR str_val])
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