I wanted to confirm the behavior of LAST() to make sure I'm not relying on 
something undocumented or likely to change. Because I couldn't find this in the 
docs.

If I do: 

SELECT LAST(f1), f2 FROM m

I am getting the last value of f1, say at time T, and the value of f2 ALSO AT 
TIME T.

If I do:

SELECT LAST(f1), LAST(f2) from m

I am getting the last value of f1, say at time T1, and the last value of f2, 
which could be at time T2 ... ie, independently.

Also, in the latest version (1.1), does it improve the performance to add a 
time-restricting where clause? I.e, 'WHERE time > now() - 1h'

Thanks!

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