Hello,

I am using SQLAlchemy on a PostgreSQL database and I was very pleased to 
find the aggregate_order_by function (http://docs.sqlalchemy.org/ccept 
ten/latest/dialects/postgresql.html#sqlalchemy.dialects.postgresql.aggregate_order_by
 
<http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#sqlalchemy.dialects.postgresql.aggregate_order_by>
).

Though, I am wondering why the "order_by" argument of the function takes 
only one column while Postgresql definitely accepts to order by a set of 
columns:

For instance:
SELECT array_agg(status ORDER BY pk_col1, pk_col2) FROM 
table_with_pk_on_two_columns GROUP BY col_x;
works fine on my PostgreSQL 9.6 database.

Am I missing something or is this simply not yet implemented?

Thank you.
Pierre.



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