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Add new system view, pg_config

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Move and refactor the underlying code for the pg_config client
application to src/common in support of sharing it with a new
system information SRF called pg_config() which makes the same
information available via SQL. Additionally wrap the SRF with a
new system view, as called pg_config.

Patch by me with extensive input and review by Michael Paquier
and additional review by Alvaro Herrera.
This commit is contained in:
Joe Conway
2016-02-17 09:12:06 -08:00
parent f1f5ec1efa
commit a5c43b8869
16 changed files with 491 additions and 410 deletions
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52
doc/src/sgml/catalogs.sgml
View File

@ -7349,6 +7349,11 @@
<entry>available versions of extensions</entry>
</row>
<row>
<entry><link linkend="view-pg-config"><structname>pg_config</structname></link></entry>
<entry>compile-time configuration parameters</entry>
</row>
<row>
<entry><link linkend="view-pg-cursors"><structname>pg_cursors</structname></link></entry>
<entry>open cursors</entry>
@ -7609,6 +7614,53 @@
</para>
</sect1>
<sect1 id="view-pg-config">
<title><structname>pg_config</structname></title>
<indexterm zone="view-pg-config">
<primary>pg_config</primary>
</indexterm>
<para>
The view <structname>pg_config</structname> describes the
compile-time configuration parameters of the currently installed
version of <productname>PostgreSQL</>. It is intended, for example, to
be used by software packages that want to interface to
<productname>PostgreSQL</> to facilitate finding the required header
files and libraries. It provides the same basic information as the
<xref linkend="app-pgconfig"> <productname>PostgreSQL</> Client
Application.
</para>
<table>
<title><structname>pg_config</> Columns</title>
<tgroup cols="3">
<thead>
<row>
<entry>Name</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>name</structfield></entry>
<entry><type>text</type></entry>
<entry>The parameter name</entry>
</row>
<row>
<entry><structfield>setting</structfield></entry>
<entry><type>text</type></entry>
<entry>The parameter value</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="view-pg-cursors">
<title><structname>pg_cursors</structname></title>