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    Default 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
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