Documentation changes for PREPARE, DEALLOCATE and EXECUTE commands. S…

…ince there

is no user-visible Postgres-XC specific change in these commands, this commit
restores the PostgreSQL documentation for these commands with some general XC specific
notes.

doc-xc/src/sgml/ecpg.sgmlin

@@ -1,13 +1,5 @@
 <!-- doc/src/sgml/ecpg.sgml -->
 
-<!-- COMMENT: K.Suzuki
-
-     This file assumes that PREPARE and EXECUTE statements will soon
-     be supported.  Description of them are scattered into so many
-     parts of the document and I found it is not practical to write
-     notice, which will be removed soon.
--->
-
 <chapter id="ecpg">
  <title><application>ECPG</application> - Embedded <acronym>SQL</acronym> in C</title>
 

doc-xc/src/sgml/ref/deallocate.sgmlin

@@ -33,15 +33,7 @@ DEALLOCATE [ PREPARE ] { <replaceable class="parameter">name</replaceable> | ALL
  <refsect1>
   <title>Description</title>
 
-&xconly;
-<!## XC>
-  <para>
-   Current relase of <productname>Postgres-XC</> does not
-   support <command>DEALLOCATE</command> command.
-  </para>
-<!## end>
-
-<!## PG>
+&common;
   <para>
    <command>DEALLOCATE</command> is used to deallocate a previously
    prepared SQL statement. If you do not explicitly deallocate a
@@ -103,7 +95,5 @@ DEALLOCATE [ PREPARE ] { <replaceable class="parameter">name</replaceable> | ALL
    <member><xref linkend="sql-execute"></member>
    <member><xref linkend="sql-prepare"></member>
   </simplelist>
-
-<!## end>
  </refsect1>
 </refentry>

doc-xc/src/sgml/ref/execute.sgmlin

@@ -32,16 +32,7 @@ EXECUTE <replaceable class="PARAMETER">name</replaceable> [ ( <replaceable class
 
  <refsect1>
   <title>Description</title>
-
-<!## XC>
-&xconly;
-  <para>
-   <command>EXECUTE</> has not been supported yet.  This may be
-   suppoted in the future releases.
-  </para>
-<!## end>
-
-<!## PG>
+&common;
   <para>
    <command>EXECUTE</command> is used to execute a previously prepared
    statement. Since prepared statements only exist for the duration of a
@@ -118,7 +109,6 @@ EXECUTE <replaceable class="PARAMETER">name</replaceable> [ ( <replaceable class
    <command>EXECUTE</command> statement also uses a somewhat different
    syntax.
   </para>
-<!## end>
  </refsect1>
 
  <refsect1>

doc-xc/src/sgml/ref/prepare.sgmlin

@@ -32,17 +32,7 @@ PREPARE <replaceable class="PARAMETER">name</replaceable> [ ( <replaceable class
 
  <refsect1>
   <title>Description</title>
-
-<!## XC>
-&xconly;
-  <para>
-   <command>PREPARE</> has not been supported
-   by <productname>Postgres-XC</> yet.  This may be supported in the
-   future releases.
-  </para>
-<!## end>
-
-<!## PG>
+&common;
   <para>
    <command>PREPARE</command> creates a prepared statement. A prepared
    statement is a server-side object that can be used to optimize
@@ -202,7 +192,6 @@ EXECUTE usrrptplan(1, current_date);
    <command>PREPARE</command> statement also uses a somewhat different
    syntax.
   </para>
-<!## end>
  </refsect1>
 
  <refsect1>