apache / apache/drill

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:
![image](https://user-images.githubusercontent.com/28873808/230514388-d739a82f-6dfc-4b58-9df5-b9f13db69ff2.png)

Reading the official documents, I have configured drill-env.sh as such:
![image](https://user-images.githubusercontent.com/28873808/230514583-5a4318b4-dcfc-4b57-a2e7-9151cffd1208.png)

Also the pod configurations:
![image](https://user-images.githubusercontent.com/28873808/230514715-ba3825c4-2080-4982-b979-5c54b7c15496.png)

{{.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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