clarify logic in nth_value window function - #14104
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alamb
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Thanks @zjregee
@Blizzara do you have a chance to review this PR (as it is related to a suggestion you made) in #14042 (comment)
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Looks good to me, thanks!
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Which issue does this PR close?
Closes #14063.
Rationale for this change
What changes are included in this PR?
This PR simplifies some of the logic of the nth_value window function, making the code path clearer and more understandable.
Are these changes tested?
Yes.
Are there any user-facing changes?
None.