Minor: extract sort col rewrite into its own module, add unit tests #5088
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Which issue does this PR close?
Related to #4854
Rationale for this change
I want to make the code easier to work with as part of the fix and breaking the PR into smaller parts will help with review
What changes are included in this PR?
No functional change is intended
Are these changes tested?
Yes
Are there any user-facing changes?
No