Generate candlestick data with no data interval by CQ

1

I want to generate candlestick data from trade data for every 1 minutes.
Then how can I handle intervals with no data?
And open is the same of close. Can I do this with CQ?

name: trades
------------------------
time                   price
2017-08-28T08:15:00Z   16.75
2017-08-28T08:15:06Z   17.75
2017-08-28T08:15:08Z   14.80
2017-08-28T08:17:10Z   16.20

CREATE CONTINUOUS QUERY "cq_basic" ON "db"
BEGIN
  SELECT first("price") as open, last("price") as close, max("price") as high, min("price") as low INTO "candlesticks" FROM "trades" GROUP BY time(1m)
END

name: candlesticks
------------------------
time                   open    close    high    low
2017-08-28T08:15:00Z   16.75   16.20    17.75    14.80
2017-08-28T08:17:00Z   14.80   16.20    16.20    14.80

There is no ‘2017-08-28T08:16:00Z’ data.
Is there anyway to handle interval with no data?
fill() is not a good solution for it.