Hi Matt,

> 
> 1. What do the double parenthesis '(( Values .... ))' mean?

Nothing, it was easier to continue typing and close one more on the phone. 
Single parenthesis are enough.

> 
> 2. What is the 'x(field)' in the column alias?

X(field) is just to make the example more readable. And name the example table 
x with the column field to illustrate the main part of the example 
encode(yourfield, 'hex')::macaddr


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