Merging two streams the number of fields in output is doubled

Hi,
I need to merge two same structured streams (from the same table but with two different select and group_concat command).

The output has to be the sum of all lines of one stream to the rows of other one.
I used FULL OUTER merge.

I.e. 3 rows from 1st and 1 rows of 2nd. Output result 4 rows.

Why the output stream make a kind of copy of all fields adding _1 ???

The output is at the end of 3 rows

Thanks

Attached Images

• merge.jpg (28.8 KB)