chenkovsky commented on issue #16515:
URL: https://github.com/apache/datafusion/issues/16515#issuecomment-3004464455
> 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]
> ```
this syntax is also valid in postgres.
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