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Date: Wed, 28 Sep 2022 13:14:56 -0400
From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>,
	Peter Eisentraut <peter.eisentraut@enterprisedb.com>,
	pgsql-committers <pgsql-committers@lists.postgresql.org>
Subject: Re: pgsql: doc: clarify recursion internal behavior
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On Thu, Sep  8, 2022 at 11:30:04AM -0400, Tom Lane wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
> > On Thu, Sep 8, 2022 at 7:24 AM Peter Eisentraut
> > <peter.eisentraut@enterprisedb.com> wrote:
> >> On 03.09.22 03:58, Bruce Momjian wrote:
> >>> +    While <literal>RECURSIVE</literal> allows queries to be specified
> >>> +    recursively, internally all queries are evaluated iteratively.
> 
> >> Is that true?  Surely there is some recursive behavior in the executor.
> 
> > I haven't read the patch, but I think the claim shown here is correct.
> 
> I'd be happier if it read "such queries" instead of "all queries".
> The latter is an extremely broad claim, and you have to ignore cases
> like recursive SQL functions in order to even argue it's true.

Done in the attached applied patch.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Indecision is a decision.  Inaction is an action.  Mark Batterson


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diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml
index 4c5a83c9cb..95559ef1ac 100644
--- a/doc/src/sgml/queries.sgml
+++ b/doc/src/sgml/queries.sgml
@@ -2173,7 +2173,7 @@ SELECT sum(n) FROM t;
   <note>
    <para>
     While <literal>RECURSIVE</literal> allows queries to be specified
-    recursively, internally all queries are evaluated iteratively.
+    recursively, internally such queries are evaluated iteratively.
    </para>
   </note>
 

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