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https://issues.apache.org/jira/browse/HIVE-650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Hammerbacher resolved HIVE-650.
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Resolution: Duplicate
Resolving as duplicate of HIVE-707 and to concentrate conversation on that
ticket (since most of the discussion has happened there).
> [UDAF] implement GROUP_CONCAT(expr)
> -------------------------------------
>
> Key: HIVE-650
> URL: https://issues.apache.org/jira/browse/HIVE-650
> Project: 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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