findepi opened a new issue, #16515:
URL: https://github.com/apache/datafusion/issues/16515
### Describe the bug
When parsing an array_agg with Postgres dialect, one can specify ordering of
values within group.
The syntax is accepted but apparently takes no effect on the aggregation
being executed.
At the very least syntax should be rejected as unsupported (then this
becomes a missing feature), or be supported.
### To Reproduce
Here the expected values were created with `cargo test --test sqllogictests
-- aggregate.slt --complete`, showing the bug
```
statement ok
set datafusion.sql_parser.dialect = 'Postgres';
query ?
SELECT array_agg(a_varchar) within group (order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[a, d, c, a]
query ?
SELECT array_agg(DISTINCT a_varchar) within group (order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[d, a, c]
```
### Expected behavior
```
statement ok
set datafusion.sql_parser.dialect = 'Postgres';
query ?
SELECT array_agg(a_varchar) within group (order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[a, a, c, d]
query ?
SELECT array_agg(DISTINCT a_varchar) within group (order by a_varchar)
FROM (VALUES ('a'), ('d'), ('c'), ('a')) t(a_varchar);
----
[a, c, d]
```
### Additional context
_No response_
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