Hi Tobias,
Couple of suggestions:
1) Can you please try WITH the WHERE clause (reducing data) just to be sure that there is no syntax error in your code and the local temporary table is created. This will also ensure that the issue is likely to be related to memory issue.
2) Can you try to unload some of the other tables / data / perform delta merge, in short, reduced the consumed memory and try the code WITHOUT where clause.
Also it will help if you can post your code to understand it better. Also mention how much data is expected in the SELECT statement, some data size in the underlying tables used in the SELECT statement.
I also hope when you mentioned FULL join, you don't mean FULL OUTER join.
Regards,
Ravi