Julian Hyde created CALCITE-4349:
------------------------------------
Summary: Support GROUP_CONCAT aggregate function for MySQL
Key: CALCITE-4349
URL: https://issues.apache.org/jira/browse/CALCITE-4349
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Support GROUP_CONCAT aggregate function for MySQL. Here is the syntax:
{noformat}
GROUP_CONCAT([DISTINCT] expr [,expr ...]
[ORDER BY {unsigned_integer | col_name | expr}
[ASC | DESC] [,col_name ...]]
[SEPARATOR str_val])
{noformat}
It is analogous to {{LISTAGG}} (see CALCITE-2754) (and also to BigQuery and
PostgreSQL's {{STRING_AGG}}, see CALCITE-4335). For example, the query
{code}
SELECT deptno, GROUP_CONCAT(ename ORDER BY empno SEPARATOR ';')
FROM Emp
GROUP BY deptno
{code}
is equivalent to (and in Calcite's algebra would be desugared to)
{code}
SELECT deptno, LISTAGG(ename, ';') WITHIN GROUP (ORDER BY empno)
FROM Emp
GROUP BY deptno
{code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
