"load_from_teradata" error - response (8) by snoynaert

The post from eceyildirim is the correct answer. Your Aster environment needs to have a minimum of two vworkers. This can be accomplished by adding another worker node or by using the changePartitionCountExec command and splitting the current single partitions into two partitions.
 
The "empty" table does not have to have the same columns as the Teradata source table. It is simply a driver table that has to be empty and physically partitioned, e.g.:
 
CREATE FACT TABLE empty(
A  int
)
DISTRIBUTE BY HASH(UserId);