database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-05 07:21:24 +03:00
Code Activity

Allow LEAKPROOF functions for better performance of security views.

Browse Source 
We don't normally allow quals to be pushed down into a view created
with the security_barrier option, but functions without side effects
are an exception: they're OK.  This allows much better performance in
common cases, such as when using an equality operator (that might
even be indexable).

There is an outstanding issue here with the CREATE FUNCTION / ALTER
FUNCTION syntax: there's no way to use ALTER FUNCTION to unset the
leakproof flag.  But I'm committing this as-is so that it doesn't
have to be rebased again; we can fix up the grammar in a future
commit.

KaiGai Kohei, with some wordsmithing by me.
This commit is contained in:
Robert Haas
2012-02-13 22:20:27 -05:00
parent 2bbd88f8f8
commit cd30728fb2
28 changed files with 3329 additions and 2427 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
doc/src/sgml/ref/alter_function.sgml
View File

@ -33,7 +33,7 @@ ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="paramet
<phrase>where <replaceable class="PARAMETER">action</replaceable> is one of:</phrase>
CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT
IMMUTABLE | STABLE | VOLATILE
IMMUTABLE | STABLE | VOLATILE | LEAKPROOF
[ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER
COST <replaceable class="parameter">execution_cost</replaceable>
ROWS <replaceable class="parameter">result_rows</replaceable>
@ -191,6 +191,17 @@ ALTER FUNCTION <replaceable>name</replaceable> ( [ [ <replaceable class="paramet
</listitem>
</varlistentry>
<varlistentry>
<term><literal>LEAKPROOF</literal></term>
<listitem>
<para>
Change whether the function is considered leakproof or not.
See <xref linkend="sql-createfunction"> for more information about
this capability.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>COST</literal> <replaceable class="parameter">execution_cost</replaceable></term>