From 7fa1e1ef741964eeb50f33d7c72622658bb7e5f4 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 21 Jul 2021 18:03:33 -0400
Subject: [PATCH] Doc: improve documentation about exponentiation operator.

Now that we're not having to wedge this into the straitjacket of
the old operator table format, we can add another example to
clarify the point about left-to-right associativity.

Per suggestion from mdione at grulic.org.ar.

https://postgr.es/m/162661954599.693.13700316547731859171@wrigleys.postgresql.org
---
 doc/src/sgml/func.sgml | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index e833be8f96..f62c33e5c7 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -988,16 +988,23 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
         <returnvalue>double precision</returnvalue>
        </para>
        <para>
-        Exponentiation (unlike typical mathematical practice, multiple uses of
-        <literal>^</literal> will associate left to right)
+        Exponentiation
        </para>
        <para>
         <literal>2 ^ 3</literal>
         <returnvalue>8</returnvalue>
        </para>
+       <para>
+        Unlike typical mathematical practice, multiple uses of
+        <literal>^</literal> will associate left to right by default:
+       </para>
        <para>
         <literal>2 ^ 3 ^ 3</literal>
         <returnvalue>512</returnvalue>
+       </para>
+       <para>
+        <literal>2 ^ (3 ^ 3)</literal>
+        <returnvalue>134217728</returnvalue>
        </para></entry>
       </row>