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Track collation versions for indexes.

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Record the current version of dependent collations in pg_depend when
creating or rebuilding an index.  When accessing the index later, warn
that the index may be corrupted if the current version doesn't match.

Thanks to Douglas Doole, Peter Eisentraut, Christoph Berg, Laurenz Albe,
Michael Paquier, Robert Haas, Tom Lane and others for very helpful
discussion.

Author: Thomas Munro <thomas.munro@gmail.com>
Author: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com> (earlier versions)
Discussion: https://postgr.es/m/CAEepm%3D0uEQCpfq_%2BLYFBdArCe4Ot98t1aR4eYiYTe%3DyavQygiQ%40mail.gmail.com
This commit is contained in:
Thomas Munro
2020-11-02 19:50:45 +13:00
parent cd6f479e79
commit 257836a755
43 changed files with 1287 additions and 94 deletions
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15
doc/src/sgml/ref/alter_index.sgml
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@@ -25,6 +25,7 @@ ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RENA
ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET TABLESPACE <replaceable class="parameter">tablespace_name</replaceable>
ALTER INDEX <replaceable class="parameter">name</replaceable> ATTACH PARTITION <replaceable class="parameter">index_name</replaceable>
ALTER INDEX <replaceable class="parameter">name</replaceable> DEPENDS ON EXTENSION <replaceable class="parameter">extension_name</replaceable>
ALTER INDEX <replaceable class="parameter">name</replaceable> ALTER COLLATION <replaceable class="parameter">collation_name</replaceable> REFRESH VERSION
ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET ( <replaceable class="parameter">storage_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )
ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RESET ( <replaceable class="parameter">storage_parameter</replaceable> [, ... ] )
ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ALTER [ COLUMN ] <replaceable class="parameter">column_number</replaceable>
@@ -112,6 +113,20 @@ ALTER INDEX ALL IN TABLESPACE <replaceable class="parameter">name</replaceable>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>ALTER COLLATION <replaceable class="parameter">collation_name</replaceable> REFRESH VERSION</literal></term>
<listitem>
<para>
Silences warnings about mismatched collation versions, by declaring
that the index is compatible with the current collation definition.
Be aware that incorrect use of this command can hide index corruption.
If you don't know whether a collation's definition has changed
incompatibly, <xref linkend="sql-reindex"/> is a safe alternative.
See <xref linkend="collation-versions"/> for more information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SET ( <replaceable class="parameter">storage_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )</literal></term>
<listitem>