Re: Add 64-bit XIDs into PostgreSQL 15

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*Hello! *

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The next edition of the xid64 patch has been implemented.

In the presented  version:

1) gathered patches MXIDOFFSETv9 [1], GUC64v2 [2], xid64 (v52-v55) (the
latest versions from the relevant threads have been used);

2) the resulted patches have been rebased onto the current master
(3f9b9621766);

3) implemented the HeapTupleCopyRawXidsFromPage. This function avoids
substitution of xids and returns their real values even in a case of a
frozen tuple;

4) fixed issues revealed by tests;

5) in addition, fixed the "stale xid64" problem at the
heapam_tuple_satisfies_snapshot function. This issue mostly appeared in
practice as the "missing chunk" error during operations on TOASTs of the
pg_statistic table.

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*Looking forward to cooperation and review,*

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Evgeny Voropaev,

TantorLabs, LLC.

<evorop(at)gmail(dot)com>

<evgeny(dot)voropaev(at)tantorlabs(dot)ru>

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*[1] MXIDOFFSETv9 -
https://www.postgresql.org/message-id/CACG%3Dezajc_Pcqmy6fcq-N8%2BLzCRMzOzJzez2_BgHEu-6RVJtKQ%40mail.gmail.com*

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*[2] GUC64v2 -
https://www.postgresql.org/message-id/4c0c1924-a68c-4b3f-bf81-5af13b1a9087%40gmail.com*

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