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Add CASCADE support for CREATE EXTENSION.

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Without CASCADE, if an extension has an unfullfilled dependency on
another extension, CREATE EXTENSION ERRORs out with "required extension
... is not installed". That is annoying, especially when that dependency
is an implementation detail of the extension, rather than something the
extension's user can make sense of.

In addition to CASCADE this also includes a small set of regression
tests around CREATE EXTENSION.

Author: Petr Jelinek, editorialized by Michael Paquier, Andres Freund
Reviewed-By: Michael Paquier, Andres Freund, Jeff Janes
Discussion: 557E0520.3040800@2ndquadrant.com
This commit is contained in:
Andres Freund
2015-10-03 18:19:37 +02:00
parent bf686796a0
commit b67aaf21e8
32 changed files with 346 additions and 89 deletions
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42
doc/src/sgml/ref/create_extension.sgml
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@ -25,6 +25,7 @@ CREATE EXTENSION [ IF NOT EXISTS ] <replaceable class="parameter">extension_name
[ WITH ] [ SCHEMA <replaceable class="parameter">schema_name</replaceable> ]
[ VERSION <replaceable class="parameter">version</replaceable> ]
[ FROM <replaceable class="parameter">old_version</replaceable> ]
[ CASCADE ]
</synopsis>
</refsynopsisdiv>
@ -94,6 +95,35 @@ CREATE EXTENSION [ IF NOT EXISTS ] <replaceable class="parameter">extension_name
If not specified, and the extension's control file does not specify a
schema either, the current default object creation schema is used.
</para>
<para>
If the extension specifies <literal>schema</> in its control file,
the schema cannot be overriden with <literal>SCHEMA</> clause.
The <literal>SCHEMA</> clause in this case works as follows:
<itemizedlist>
<listitem>
<para>
If <replaceable class="parameter">schema_name</replaceable> matches
the schema in control file, it will be used normally as there is no
conflict.
</para>
</listitem>
<listitem>
<para>
If the <literal>CASCADE</> clause is given, the
<replaceable class="parameter">schema_name</replaceable> will only
be used for the missing required extensions which do not specify
<literal>schema</> in their control files.
</para>
</listitem>
<listitem>
<para>
If <replaceable class="parameter">schema_name</replaceable> is not
the same as the one in extension's control file and the
<literal>CASCADE</> clause is not given, error will be thrown.
</para>
</listitem>
</itemizedlist>
</para>
<para>
Remember that the extension itself is not considered to be within any
schema: extensions have unqualified names that must be unique
@ -139,6 +169,18 @@ CREATE EXTENSION [ IF NOT EXISTS ] <replaceable class="parameter">extension_name
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</></term>
<listitem>
<para>
Try to install extension including the required dependencies
recursively. The <literal>SCHEMA</> option will be propagated
to the required extensions. Other options are not recursively
applied when using this clause.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>