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Database-level collation version tracking

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This adds to database objects the same version tracking that collation
objects have.  There is a new pg_database column datcollversion that
stores the version, a new function
pg_database_collation_actual_version() to get the version from the
operating system, and a new subcommand ALTER DATABASE ... REFRESH
COLLATION VERSION.

This was not originally added together with pg_collation.collversion,
since originally version tracking was only supported for ICU, and ICU
on a database-level is not currently supported.  But we now have
version tracking for glibc (since PG13), FreeBSD (since PG14), and
Windows (since PG13), so this is useful to have now.

Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f0ff3190-29a3-5b39-a179-fa32eee57db6%40enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-02-14 08:09:04 +01:00
parent 9898c5e03c
commit 37851a8b83
22 changed files with 367 additions and 15 deletions
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3
doc/src/sgml/ref/alter_collation.sgml
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@@ -151,7 +151,8 @@ HINT: Rebuild all objects affected by this collation and run ALTER COLLATION pg
</para>
</note>
<para>
Currently, there is no version tracking for the database default collation.
For the database default collation, there is an analogous command
<literal>ALTER DATABASE ... REFRESH COLLATION VERSION</literal>.
</para>
<para>