How do you configure "Actively Used Direct (Estimate)" memory in "Metrics" tab of Drill Web UI?
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Description
Hello,
I am deploying drillbits as kubernetes pods on my kubernetes cluster. However, my drillbit pod doesn't seem like it's using direct memory for querying quite a large data set (180 million rows, 27 gb of size) as below:

Reading the official documents, I have configured drill-env.sh as such:

Also the pod configurations:

{{.Values.drill.memory}} is set to 4gbs at the moment.
Any clues where I should configure to use up some direct memory and increase performance of query execution?
Thanks for reading!
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