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Add support for SET ACCESS METHOD in ALTER TABLE

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The logic used to support a change of access method for a table is
similar to changes for tablespace or relation persistence, requiring a
table rewrite with an exclusive lock of the relation changed.  Table
rewrites done in ALTER TABLE already go through the table AM layer when
scanning tuples from the old relation and inserting them into the new
one, making this implementation straight-forward.

Note that partitioned tables are not supported as these have no access
methods defined.

Author: Justin Pryzby, Jeff Davis
Reviewed-by: Michael Paquier, Vignesh C
Discussion: https://postgr.es/m/20210228222530.GD20769@telsasoft.com
This commit is contained in:
Michael Paquier
2021-07-28 10:10:44 +09:00
parent 4b763ff642
commit b0483263dd
11 changed files with 173 additions and 15 deletions
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20
doc/src/sgml/ref/alter_table.sgml
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@ -75,6 +75,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
CLUSTER ON <replaceable class="parameter">index_name</replaceable>
SET WITHOUT CLUSTER
SET WITHOUT OIDS
SET ACCESS METHOD <replaceable class="parameter">new_access_method</replaceable>
SET TABLESPACE <replaceable class="parameter">new_tablespace</replaceable>
SET { LOGGED | UNLOGGED }
SET ( <replaceable class="parameter">storage_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )
@ -692,6 +693,16 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SET ACCESS METHOD</literal></term>
<listitem>
<para>
This form changes the access method of the table by rewriting it. See
<xref linkend="tableam"/> for more information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SET TABLESPACE</literal></term>
<listitem>
@ -1228,6 +1239,15 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">new_access_method</replaceable></term>
<listitem>
<para>
The name of the access method to which the table will be converted.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">new_tablespace</replaceable></term>
<listitem>