Hi, I was wondering if someone could help me understand what the correct way is to represent and write out NA values using a TypedColumnWriter. Basically, what I want to do is, e.g., repeatedly write out batches of doubles where some of them may arbitrarily be None's. It seemed like maybe some combination of OPTIONAL, definition levels, and valid bits might work, but it wasn't exactly clear to me. So, if someone could point me in the right direction I would appreciate it.
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