Hi,
I've read the released draft documentation and I have found it quite clear and easy to understand.
As I couldn't comment on the Google document itself (no permissions), I'd like to report a small mistake for the SELECT operator. The resulting collection of tuples should contain only one tuple, as for the following tuple the predicate "p = price is greater than or equal to 30" returns false.
<numbers:(23, 4), book:”Everyday Italian”, author:"Giada De Laurentiis”, price:29.99>
Best regards,
Mihail