Hmmm... Looks like something I wanted to use as well at some point, but was not really sure how.
Anyway, given the setup, I don't think it'd work, and here's why:
a_id | a_name | b_name | c_name
------+--------+-----------+-----------
1 | first | 1b 1 of 2 | 1c 1 of 1
1 | first | 1b 2 of 2 | 1c 1 of 1
2 | second | 2b 1 of 2 | 2c 1 of 2
2 | second | 2b 1 of 2 | 2c 2 of 2
2 | second | 2b 1 of 2 | 2c 1 of 2
2 | second | 2b 1 of 2 | 2c 2 of 2
3 | third | 3b 1 of 1 |
4 | fourth | | 4c 1 of 1
This is, as I'm sure you recognized, a result of your select. Note the highlighted part -- you've got multiple combinations of the same b_name and c_name, and I think that listbuilder get completely lost -- it's sort of like doing a join, but forgetting to provide a proper key, ending up with a product...
What could help (but I think this is *not* what you're looking for), is to first do a select out of tables B and C if distinct names and a-Id's, and then join then onto A...
