Ok, thank you very much for your explanation,
maybe I need something else in my case.
As far as I understand, "On-disk toasted data for tuples from the WAL
are not guaranteed in any way to be retain", but still, the LATEST
value for the same cell should exist in postgres (in on-disk toast if
it is huge, or not).
If I cannot get access to the on-disk toasted data for tuple from the
WAL, can I have the access to the _latest_ value in this case
(hopefully I describe it correct)
> Yes, that's not possible in general. On-disk toasted data for tuples
> from the WAL are not guaranteed in any way to be retained. If that
> weren't the case database tables would bloat while logical replication
> is behind, and the sequential reads (i.e. fast) reads of logical
> decoding would turn into random IO.
Mit freundlichen Grüßen,
Georgy Buranov
