GitHub user combineads opened a pull request:
https://github.com/apache/tajo/pull/1029
TAJO-2160: Implement string_agg function.
I'll implement to concatenate the strings of a field within a group by
query.
I have a table:
ID COMPANY_ID EMPLOYEE
1 1 Anna
2 1 Bill
3 2 Carol
4 2 Dave
and I wanted to group by company_id to get something like:
SELECT company_id, string_agg(employee, ', ')
FROM mytable
GROUP BY company_id;
COMPANY_ID EMPLOYEE
1 Anna, Bill
2 Carol, Dave
PostgreSQL supports string_agg function.
http://www.postgresql.org/docs/current/static/functions-aggregate.html#FUNCTIONS-AGGREGATE-
TABLE
Thank you.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/combineads/tajo TAJO-2160
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/1029.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1029
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commit 6bda513bb7c270c252986dfd43ee80f5b59d8eea
Author: Byunghwa Yun <[email protected]>
Date: 2016-05-20T09:43:40Z
TAJO-2160: Implement string_agg function.
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