pgsql-bugs(at)postgresql(dot)org wrote:
> test_pg=# SELECT distinct id from array_test ;
> ERROR: Unable to identify an ordering operator '<' for type 'integer[]'
> Use an explicit ordering operator or modify the query
> test_pg=#
There is no bug here. As the error says, there is currently no ordering
operator for arrays. There is a *possibility* that it will change in
7.4. But it hasn't happened yet, and time is running short, so don't
count on it.
Joe