doc: Add comments to clarify algorithm for MarkJoins
#16436
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alamb
reviewed
Jun 18, 2025
alamb
approved these changes
Jun 19, 2025
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Which issue does this PR close?
Rationale for this change
The algorithm that is used for mark joins in
calculate_indices_by_join_typemight be confusing for newer contributors so we should add a comment to clarify.What changes are included in this PR?
Added comments with an example to explain how the algorithm works.