How would one use Evaluator to create (1) a largest file size column for a given folder and (2) a largest file column for a given folder and all its subfolders?
You couldn't.
What is the limitation?
When you say largest file size column, do you mean a column that shows the biggest file size in a given folder? I'm not sure what you mean by largest file column, sorry.
The column would show the size of the largest file in a given folder, similar to Columns: Maximum and Average File Size
No, you can't do that with Evaluator, sorry.
You can't read an entire folder via Evaluator. Or query Everything.
I'm not sure what's the user case for this one, but you can use scripting for that. Should be faster via Everything, you can use this script as a sample if you like.
Thanks for clarifying and providing an alternative. Unfortunately, that script is way over my head.
Try this one.
Newest-Oldest.opusscriptinstall (5.2 KB)
- Biggest Filesize
- Biggest File
- Biggest Filesize (Rec)
- Biggest File (Rec)
- Smaller Filesize
- Smaller File
- Smaller Filesize (Rec)
- Smaller File (Rec)
Let me know if I broke something 
In that script, adding new Everything-based columns is pretty straightforward. The main issue now is that the name no longer does them justice.
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How about "Extreme Columns" 
No, that would be too extreme
Much faster than the old one!
I will study this and see what I can learn, thanks!