fread - OOM issue

**Issue:**

+1 for the awesome package.

Encountering Out Of Memory issue when reading a LARGE csv file (~200 million rows) using fread.
Datatable code is being run on an **_aks-cluster_** with 20Gi of RAM and its still tripping

**Code:**

csv file:

**Expected behavior:**
Being able to load the file and perform manipulations.

**Environment:**
datatable version - 1.0.0
python version - 3.8.0
operating system - linux

Any pointers on how to do the aforementioned task in a memory efficient way would be of great help.

Thanks.