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Commit82a4798

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Arrange for SET LOCAL's effects to persist until the end of the current top
transaction, unless rolled back or overridden by a SET clause for the samevariable attached to a surrounding function call. Per discussion, theseseem the best semantics. Note that this is an INCOMPATIBLE CHANGE: in 8.0through 8.2, SET LOCAL's effects disappeared at subtransaction commit(leading to behavior that made little sense at the SQL level).I took advantage of the opportunity to rewrite and simplify the GUC variablesave/restore logic a little bit. The old idea of a "tentative" value is gone;it was a hangover from before we had a stack. Also, we no longer need a stackentry for every nesting level, but only for those in which a variable's valueactually changed.
1 parentb366562 commit82a4798

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16 files changed

+798
-494
lines changed

16 files changed

+798
-494
lines changed

‎doc/src/sgml/ref/create_function.sgml‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.77 2007/09/03 18:46:29 tgl Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.78 2007/09/11 00:06:41 tgl Exp $
33
-->
44

55
<refentry id="SQL-CREATEFUNCTION">
@@ -475,11 +475,11 @@ CREATE FUNCTION foo(int, out text) ...
475475
</para>
476476

477477
<para>
478-
Ifany <literal>SET</>clauses are attached to a function, then
478+
Ifa <literal>SET</>clause is attached to a function, then
479479
the effects of a <command>SET LOCAL</> command executed inside the
480-
function are restricted to the function: the configuration parameter's
481-
value is restored at function exit. This is true even for parameters
482-
not mentioned in the <literal>SET</> clause(s).However, an ordinary
480+
functionfor the same variableare restricted to the function: the
481+
configuration parameter's priorvalue isstillrestored at function exit.
482+
However, an ordinary
483483
<command>SET</> command (without <literal>LOCAL</>) overrides the
484484
<literal>SET</> clause, much as it would do for a previous <command>SET
485485
LOCAL</> command: the effects of such a command will persist after

‎doc/src/sgml/ref/prepare_transaction.sgml‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/prepare_transaction.sgml,v 1.5 2006/09/16 00:30:19 momjian Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/prepare_transaction.sgml,v 1.6 2007/09/11 00:06:41 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -94,7 +94,8 @@ PREPARE TRANSACTION <replaceable class="PARAMETER">transaction_id</replaceable>
9494
</para>
9595

9696
<para>
97-
If the transaction modified any run-time parameters with <command>SET</>,
97+
If the transaction modified any run-time parameters with <command>SET</>
98+
(without the <literal>LOCAL</> option),
9899
those effects persist after <command>PREPARE TRANSACTION</>, and will not
99100
be affected by any later <command>COMMIT PREPARED</command> or
100101
<command>ROLLBACK PREPARED</command>. Thus, in this one respect

‎doc/src/sgml/ref/reset.sgml‎

Lines changed: 22 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/reset.sgml,v 1.35 2007/04/26 16:13:09 neilc Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/reset.sgml,v 1.36 2007/09/11 00:06:41 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -44,13 +44,16 @@ SET <replaceable class="parameter">configuration_parameter</replaceable> TO DEFA
4444
have had, if no <command>SET</> had ever been issued for it in the
4545
current session. The actual source of this value might be a
4646
compiled-in default, the configuration file, command-line options,
47-
or per-database or per-user default settings. See <xref
48-
linkend="runtime-config"> for details.
47+
or per-database or per-user default settings. This is subtly different
48+
from defining it as <quote>the value that the parameter had at session
49+
start</>, because if the value came from the configuration file, it
50+
will be reset to whatever is specified by the configuration file now.
51+
See <xref linkend="runtime-config"> for details.
4952
</para>
5053

5154
<para>
52-
See the<command>SET</>reference page for details on the
53-
transaction behavior of<command>RESET</>.
55+
The transactional behavior of<command>RESET</>is the same as
56+
<command>SET</>: its effects will be undone by transaction rollback.
5457
</para>
5558
</refsect1>
5659

@@ -62,8 +65,9 @@ SET <replaceable class="parameter">configuration_parameter</replaceable> TO DEFA
6265
<term><replaceable class="PARAMETER">configuration_parameter</replaceable></term>
6366
<listitem>
6467
<para>
65-
The name of a run-time parameter. See <xref linkend="sql-set"
66-
endterm="sql-set-title"> for a list.
68+
Name of a settable run-time parameter. Available parameters are
69+
documented in <xref linkend="runtime-config"> and on the
70+
<xref linkend="sql-set" endterm="sql-set-title"> reference page.
6771
</para>
6872
</listitem>
6973
</varlistentry>
@@ -83,9 +87,9 @@ SET <replaceable class="parameter">configuration_parameter</replaceable> TO DEFA
8387
<title>Examples</title>
8488

8589
<para>
86-
Set the <varname>geqo</> configuration variable to its default value:
90+
Set the <varname>timezone</> configuration variable to its default value:
8791
<screen>
88-
RESETgeqo;
92+
RESETtimezone;
8993
</screen>
9094
</para>
9195
</refsect1>
@@ -97,4 +101,13 @@ RESET geqo;
97101
<command>RESET</command> is a <productname>PostgreSQL</productname> extension.
98102
</para>
99103
</refsect1>
104+
105+
<refsect1>
106+
<title>See Also</title>
107+
108+
<simplelist type="inline">
109+
<member><xref linkend="SQL-SET" endterm="SQL-SET-title"></member>
110+
<member><xref linkend="SQL-SHOW" endterm="SQL-SHOW-title"></member>
111+
</simplelist>
112+
</refsect1>
100113
</refentry>

‎doc/src/sgml/ref/set.sgml‎

Lines changed: 46 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.90 2006/09/22 16:20:00 tgl Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.91 2007/09/11 00:06:41 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -40,13 +40,10 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
4040
</para>
4141

4242
<para>
43-
If <command>SET</command> or <command>SET SESSION</command> is issued
44-
within a transaction that is later aborted, the effects of the
43+
If <command>SET</command>(orequivalently<command>SET SESSION</command>)
44+
is issuedwithin a transaction that is later aborted, the effects of the
4545
<command>SET</command> command disappear when the transaction is rolled
46-
back. (This behavior represents a change from
47-
<productname>PostgreSQL</productname> versions prior to 7.3, where
48-
the effects of <command>SET</command> would not roll back after a later
49-
error.) Once the surrounding transaction is committed, the effects
46+
back. Once the surrounding transaction is committed, the effects
5047
will persist until the end of the session, unless overridden by another
5148
<command>SET</command>.
5249
</para>
@@ -59,6 +56,36 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
5956
seen until the end of the transaction, but afterwards (if the transaction
6057
is committed) the <command>SET</command> value will take effect.
6158
</para>
59+
60+
<para>
61+
The effects of <command>SET</command> or <command>SET LOCAL</command> are
62+
also canceled by rolling back to a savepoint that is earlier than the
63+
command.
64+
</para>
65+
66+
<para>
67+
If <command>SET LOCAL</command> is used within a function that has a
68+
<literal>SET</> option for the same variable (see
69+
<xref linkend="sql-createfunction" endterm="sql-createfunction-title">),
70+
the effects of the <command>SET LOCAL</command> command disappear at
71+
function exit; that is, the value in effect when the function was called is
72+
restored anyway. This allows <command>SET LOCAL</command> to be used for
73+
dynamic or repeated changes of a parameter within a function, while still
74+
having the convenience of using the <literal>SET</> option to save and
75+
restore the caller's value. However, a regular <command>SET</> command
76+
overrides any surrounding function's <literal>SET</> option; its effects
77+
will persist unless rolled back.
78+
</para>
79+
80+
<note>
81+
<para>
82+
In <productname>PostgreSQL</productname> versions 8.0 through 8.2,
83+
the effects of a <command>SET LOCAL</command> would be canceled by
84+
releasing an earlier savepoint, or by successful exit from a
85+
<application>PL/pgSQL</application> exception block. This behavior
86+
has been changed because it was deemed unintuitive.
87+
</para>
88+
</note>
6289
</refsect1>
6390

6491
<refsect1>
@@ -106,8 +133,11 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
106133
<para>
107134
New value of parameter. Values can be specified as string
108135
constants, identifiers, numbers, or comma-separated lists of
109-
these. <literal>DEFAULT</literal> can be used to specify
110-
resetting the parameter to its default value.
136+
these, as appropriate for the particular parameter.
137+
<literal>DEFAULT</literal> can be written to specify
138+
resetting the parameter to its default value (that is, whatever
139+
value it would have had if no <command>SET</> had been executed
140+
in the current session).
111141
</para>
112142
</listitem>
113143
</varlistentry>
@@ -200,7 +230,9 @@ SELECT setseed(<replaceable>value</replaceable>);
200230
<term><literal>DEFAULT</literal></term>
201231
<listitem>
202232
<para>
203-
Set the time zone to your local time zone (the one that
233+
Set the time zone to your local time zone (that is, the
234+
server's default value of <varname>timezone</>; if this
235+
has not been explicitly set anywhere, it will be the zone that
204236
the server's operating system defaults to).
205237
</para>
206238
</listitem>
@@ -221,7 +253,10 @@ SELECT setseed(<replaceable>value</replaceable>);
221253

222254
<para>
223255
The function <function>set_config</function> provides equivalent
224-
functionality. See <xref linkend="functions-admin">.
256+
functionality; see <xref linkend="functions-admin">.
257+
Also, it is possible to UPDATE the
258+
<link linkend="view-pg-settings"><structname>pg_settings</structname></link>
259+
system view to perform the equivalent of <command>SET</>.
225260
</para>
226261
</refsect1>
227262

‎doc/src/sgml/ref/show.sgml‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/show.sgml,v 1.42 2006/09/16 00:30:20 momjian Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/show.sgml,v 1.43 2007/09/11 00:06:41 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -36,7 +36,7 @@ SHOW ALL
3636
the <envar>PGOPTIONS</envar> environmental variable (when using
3737
<application>libpq</> or a <application>libpq</>-based
3838
application), or through command-line flags when starting the
39-
<command>postgres</command>. See <xref
39+
<command>postgres</command> server. See <xref
4040
linkend="runtime-config"> for details.
4141
</para>
4242
</refsect1>
@@ -130,7 +130,11 @@ SHOW ALL
130130

131131
<para>
132132
The function <function>current_setting</function> produces
133-
equivalent output. See <xref linkend="functions-admin">.
133+
equivalent output; see <xref linkend="functions-admin">.
134+
Also, the
135+
<link linkend="view-pg-settings"><structname>pg_settings</structname></link>
136+
system view produces the same information.
137+
134138
</para>
135139
</refsect1>
136140

‎src/backend/utils/adt/ri_triggers.c‎

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
1515
*
1616
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
1717
*
18-
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.96 2007/08/15 19:15:46 tgl Exp $
18+
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.97 2007/09/11 00:06:42 tgl Exp $
1919
*
2020
* ----------
2121
*/
@@ -2749,7 +2749,7 @@ RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
27492749
snprintf(workmembuf,sizeof(workmembuf),"%d",maintenance_work_mem);
27502750
(void)set_config_option("work_mem",workmembuf,
27512751
PGC_USERSET,PGC_S_SESSION,
2752-
true, true);
2752+
GUC_ACTION_LOCAL, true);
27532753

27542754
if (SPI_connect()!=SPI_OK_CONNECT)
27552755
elog(ERROR,"SPI_connect failed");
@@ -2832,13 +2832,12 @@ RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
28322832

28332833
/*
28342834
* Restore work_mem for the remainder of the current transaction. This is
2835-
* another SET LOCAL, so it won't affect the session value, nor any
2836-
* tentative value if there is one.
2835+
* another SET LOCAL, so it won't affect the session value.
28372836
*/
28382837
snprintf(workmembuf,sizeof(workmembuf),"%d",old_work_mem);
28392838
(void)set_config_option("work_mem",workmembuf,
28402839
PGC_USERSET,PGC_S_SESSION,
2841-
true, true);
2840+
GUC_ACTION_LOCAL, true);
28422841

28432842
return true;
28442843
}

‎src/backend/utils/fmgr/fmgr.c‎

Lines changed: 3 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.109 2007/09/03 00:39:18 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.110 2007/09/11 00:06:42 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -925,20 +925,18 @@ fmgr_security_definer(PG_FUNCTION_ARGS)
925925

926926
if (fcache->proconfig)
927927
{
928-
/* The options are processed as if by SET LOCAL var = val */
929928
ProcessGUCArray(fcache->proconfig,
930929
(superuser() ?PGC_SUSET :PGC_USERSET),
931930
PGC_S_SESSION,
932-
true);
931+
GUC_ACTION_SAVE);
933932
}
934933

935934
result=FunctionCallInvoke(fcinfo);
936935
}
937936
PG_CATCH();
938937
{
939938
fcinfo->flinfo=save_flinfo;
940-
if (fcache->proconfig)
941-
AtEOXact_GUC(false,save_nestlevel);
939+
/* We don't need to restore GUC settings, outer xact abort will */
942940
if (OidIsValid(fcache->userid))
943941
SetUserId(save_userid);
944942
PG_RE_THROW();

‎src/backend/utils/init/miscinit.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.163 2007/09/03 00:39:18 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.164 2007/09/11 00:06:42 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -453,7 +453,7 @@ InitializeSessionUserId(const char *rolename)
453453
* right to insert an option into pg_authid was checked when it was
454454
* inserted.
455455
*/
456-
ProcessGUCArray(a,PGC_SUSET,PGC_S_USER,false);
456+
ProcessGUCArray(a,PGC_SUSET,PGC_S_USER,GUC_ACTION_SET);
457457
}
458458

459459
ReleaseSysCache(roleTup);

‎src/backend/utils/init/postinit.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.177 2007/09/03 00:39:18 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.178 2007/09/11 00:06:42 tgl Exp $
1212
*
1313
*
1414
*-------------------------------------------------------------------------
@@ -255,7 +255,7 @@ CheckMyDatabase(const char *name, bool am_superuser)
255255
* right to insert an option into pg_database was checked when it
256256
* was inserted.
257257
*/
258-
ProcessGUCArray(a,PGC_SUSET,PGC_S_DATABASE,false);
258+
ProcessGUCArray(a,PGC_SUSET,PGC_S_DATABASE,GUC_ACTION_SET);
259259
}
260260
}
261261

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