[ngzhian]

The SQL version reads left-to-right, similar to how ReQL's version reads top to bottom, and both reflects the execution order (in terms of a common way of text flow). From my understanding, ReQL does not do any form of optimization based on the complete query, the `.()` punctuates the flow of command. Whereas and SQL statement is just one compound thing made up of different commands where the SQL engine can optimize, which makes it hard to tell.