multidimensional array

Postgres query result (List of lists) fills only the first column in form Table

I am a new to java and Bonita (although not to BPM) and I am trying to display a sql query result in a standard Bonita UI table version 7.1 (using the Table widget). But all the data ends up in the most left column like this example below:

1OWTwFcV.png

What did I do to get to this?

I defined a postgresql dataconnector, that shows a working Array when testing:

1OVozpJJ.png

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