fix_manual_of_alter_index.patch

diff --git a/doc/src/sgml/ref/alter_index.sgml b/doc/src/sgml/ref/alter_index.sgml
index 6d34dbb74e..1b5b1f7ef1 100644
--- a/doc/src/sgml/ref/alter_index.sgml
+++ b/doc/src/sgml/ref/alter_index.sgml
@@ -27,7 +27,7 @@ ALTER INDEX <replaceable class="parameter">name</replaceable> ATTACH PARTITION <
 ALTER INDEX <replaceable class="parameter">name</replaceable> DEPENDS ON EXTENSION <replaceable class="parameter">extension_name</replaceable>
 ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> SET ( <replaceable class="parameter">storage_parameter</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
 ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RESET ( <replaceable class="parameter">storage_parameter</replaceable> [, ... ] )
-ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ALTER [ COLUMN ] <replaceable class="parameter">column_number</replaceable>
+ALTER INDEX [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ALTER [ COLUMN ] <replaceable class="parameter">column_number</replaceable> | <replaceable class="parameter">column_name</replaceable>
     SET STATISTICS <replaceable class="parameter">integer</replaceable>
 ALTER INDEX ALL IN TABLESPACE <replaceable class="parameter">name</replaceable> [ OWNED BY <replaceable class="parameter">role_name</replaceable> [, ... ] ]
     SET TABLESPACE <replaceable class="parameter">new_tablespace</replaceable> [ NOWAIT ]
@@ -137,14 +137,12 @@ ALTER INDEX ALL IN TABLESPACE <replaceable class="parameter">name</replaceable>
    </varlistentry>
 
    <varlistentry>
-    <term><literal>ALTER [ COLUMN ] <replaceable class="parameter">column_number</replaceable> SET STATISTICS <replaceable class="parameter">integer</replaceable></literal></term>
+    <term><literal>ALTER [ COLUMN ] <replaceable class="parameter">column_number | column_name</replaceable> SET STATISTICS <replaceable class="parameter">integer</replaceable></literal></term>
     <listitem>
      <para>
       This form sets the per-column statistics-gathering target for
       subsequent <xref linkend="sql-analyze"/> operations, though can
       be used only on index columns that are defined as an expression.
-      Since expressions lack a unique name, we refer to them using the
-      ordinal number of the index column.
       The target can be set in the range 0 to 10000; alternatively, set it
       to -1 to revert to using the system default statistics
       target (<xref linkend="guc-default-statistics-target"/>).
@@ -175,6 +173,15 @@ ALTER INDEX ALL IN TABLESPACE <replaceable class="parameter">name</replaceable>
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><replaceable class="parameter">column_name</replaceable></term>
+      <listitem>
+       <para>
+        The name of an existing index column.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
       <term><replaceable class="parameter">column_number</replaceable></term>
       <listitem>