Documentation for "..." in projection about preql HOT 1 OPEN

Yes, the join() operation returns a struct for each table. Joining two tables creates two structs.

From the docs (https://preql.readthedocs.io/en/latest/preql-modules.html#join):

Returns: A new table, where each column is a struct representing one of the joined tables.

When you do join_result{...n}, you are telling Preql to inline the struct called n. You could also do join_result{n.item}, with a similar result in that case.

In Preql, my_table {...} is essentially a no-op, which just returns all the columns. If they are structs, they will remain structs.

I hope it's clearer now.

If you have suggestions on how to improve the docs or tutorial, I'll be happy to hear them.

edit: You can also do join_result{...n, ...c}, which will inline both structs.

from preql.