We have this manual test where it does a COUNT over 26 million JSON keys. From the results it looks like we have regressed and are slower by 2x on current 1.8.0 master 1.8.0-SNAPSHOT git commit ID : 57dc9f43
Query takes over 30 seconds to execute consistently over several runs. Note that since this is a single large JSON file there is just one fragment doing all the work.
On Drill 1.2.0 the above query took 13.949 seconds