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Fix ALTER SEQUENCE so that it does not affect the value of currval() for

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the sequence.  Also, make setval() with is_called = false not affect the
currval state, either.  Per report from Kris Jurka that an implicit
ALTER SEQUENCE OWNED BY unexpectedly caused currval() to become valid.
Since this isn't 100% backwards compatible, it will go into HEAD only;
I'll put a more limited patch into 8.2.
This commit is contained in:
Tom Lane
2007-10-25 18:54:03 +00:00
parent dbe48765cd
commit 9ddfe034c7
3 changed files with 49 additions and 24 deletions
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13
doc/src/sgml/ref/alter_sequence.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_sequence.sgml,v 1.18 2007/10/03 16:48:43 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_sequence.sgml,v 1.19 2007/10/25 18:54:03 tgl Exp $
PostgreSQL documentation
-->
@@ -114,7 +114,10 @@ ALTER SEQUENCE <replaceable class="parameter">name</replaceable> SET SCHEMA <rep
<para>
The optional clause <literal>RESTART WITH <replaceable
class="parameter">start</replaceable></literal> changes the
current value of the sequence.
current value of the sequence. This is equivalent to calling the
<function>setval</> function with <literal>is_called</literal> =
<literal>false</>: the specified value will be returned by the
<emphasis>next</> call of <function>nextval</>.
</para>
</listitem>
</varlistentry>
@@ -226,6 +229,12 @@ ALTER SEQUENCE <replaceable class="parameter">name</replaceable> SET SCHEMA <rep
immediately.
</para>
<para>
<command>ALTER SEQUENCE</command> does not affect the <function>currval</>
status for the sequence. (Before <productname>PostgreSQL</productname>
8.3, it sometimes did.)
</para>
<para>
Some variants of <command>ALTER TABLE</command> can be used with
sequences as well; for example, to rename a sequence it is also