Add options to force quoting of all identifiers.

I've added a quote_all_identifiers GUC which affects the behavior
of the backend, and a --quote-all-identifiers argument to pg_dump
and pg_dumpall which sets the GUC and also affects the quoting done
internally by those applications.

Design by Tom Lane; review by Alex Hunsaker; in response to bug #5488
filed by Hartmut Goebel.

doc/src/sgml/config.sgml

@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.298 2010/07/20 00:47:52 rhaas Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.299 2010/07/22 01:22:32 rhaas Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -5209,6 +5209,23 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
       </listitem>
      </varlistentry>
 
+    <varlistentry id="guc-quote-all-identifiers" xreflabel="quote-all-identifiers">
+      <term><varname>quote_all_identifiers</varname> (<type>boolean</type>)</term>
+      <indexterm>
+       <primary><varname>quote_all_identifiers</> configuration parameter</primary>
+      </indexterm>
+      <listitem>
+       <para>
+        When the database generates SQL, force all identifiers to be quoted,
+        even if they are not (currently) keywords.  This will affect the
+        output of <command>EXPLAIN</> as well as the results of functions
+        like <function>pg_get_viewdef</>.  See also the
+	    <option>--quote-all-identifiers</option> to
+        <xref linkend="app-pgdump"> and <xref linkend="app-pg-dumpall">.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-sql-inheritance" xreflabel="sql_inheritance">
       <term><varname>sql_inheritance</varname> (<type>boolean</type>)</term>
       <indexterm>

doc/src/sgml/ref/pg_dump.sgml

@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.117 2010/02/23 17:28:09 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.118 2010/07/22 01:22:33 rhaas Exp $
 PostgreSQL documentation
 -->
 
@@ -660,6 +660,17 @@ PostgreSQL documentation
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><option>--quote-all-identifiers</></term>
+      <listitem>
+       <para>
+        Force quoting of all identifiers.  This may be useful when dumping a
+        database for migration to a future version that may have introduced
+        additional keywords.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
        <term><option>-?</></term>
        <term><option>--help</></term>

doc/src/sgml/ref/pg_dumpall.sgml

@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dumpall.sgml,v 1.82 2010/04/03 07:23:01 petere Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dumpall.sgml,v 1.83 2010/07/22 01:22:33 rhaas Exp $
 PostgreSQL documentation
 -->
 
@@ -356,6 +356,17 @@ PostgreSQL documentation
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><option>--quote-all-identifiers</></term>
+      <listitem>
+       <para>
+        Force quoting of all identifiers.  This may be useful when dumping a
+        database for migration to a future version that may have introduced
+        additional keywords.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
        <term><option>-?</></term>
        <term><option>--help</></term>