Postgres padding alignment: fix and improve
What does this MR do and why?
Polish the document about optimization of column order in Postgres tables.
- Fix the information about alignment for various data types
- Simplify and elaborate the example (get rid of confusing varlena, provide a concrete example, show details with pageinspect)
Triggered by discussion: https://news.ycombinator.com/item?id=32071557
MR acceptance checklist
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Edited by Nikolay Samokhvalov