Hello, Here's a rebase of a refactoring patch that got lost behind a filing cabinet on another thread even though there seemed to be some agreement that we probably want something like this[1]. It introduces a new type SegmentNumber, instead of using BlockNumber to represent segment numbers.
[1] https://www.postgresql.org/message-id/flat/
0001-Introduce-SegmentNumber-typedef-for-relation-segment.patch
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