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Doc: improve documentation about exponentiation operator.

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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
This commit is contained in:
Tom Lane 2021-07-21 18:03:33 -04:00
parent 0b5dc1f171
commit 8344979d5b
1 changed files with 9 additions and 2 deletions
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11
doc/src/sgml/func.sgml
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@ -1007,16 +1007,23 @@ 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>