findepi commented on issue #16515:
URL: https://github.com/apache/datafusion/issues/16515#issuecomment-2996833967
FWIW an alternative syntax works
```
statement ok
set datafusion.sql_parser.dialect = 'Generic';
query ?
SELECT array_agg(a_varchar order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[a, a, c, d]
query ?
SELECT array_agg(DISTINCT a_varchar order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[a, c, d]
```
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