doc: mention GROUP BY columns can reference target col numbers

bmomjian · bmomjian · commit e1ae79b99a9c · 2023-09-26T17:31:05.000-04:00
Reported-by: hape <postgres-hape@gmx.de> Discussion: https://postgr.es/m/168871536004.379168.9352636188330923805@wrigleys.postgresql.org Backpatch-through: 11
diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml
@@ -129,6 +129,9 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]
       eliminates groups that do not satisfy the given condition.  (See
       <xref linkend="sql-groupby" endterm="sql-groupby-title"/> and
       <xref linkend="sql-having" endterm="sql-having-title"/> below.)
+      Although query output columns are nominally computed in the next
+      step, they can also be referenced (by name or ordinal number)
+      in the <literal>GROUP BY</literal> clause.
      </para>
     </listitem>
 
