doc: Improve explanations when a table rewrite is needed

Peter Eisentraut <peter@eisentraut.org>

Commit: 06c4f3ae804e6680ff03a09c1f89dfb1ca3d90e9
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-05-01T06:57:48Z
Releases: 18.0
doc: Improve explanations when a table rewrite is needed

Further improvement for commit 11bd8318602.  That commit confused
identity and generated columns; fix that.  Also, virtual generated
columns have since been added; add more details about that.  Also some
small rewordings and reformattings to further improve clarity.

Reviewed-by: Robert Treat <rob@xzilla.net>
Discussion: https://postgr.es/m/00e6eb5f5c793b8ef722252c7a519c9a@oss.nttdata.com

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doc/src/sgml/ref/alter_table.sgml modified +16 −7

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