From: Jan Wieck <janwieck@yahoo.com>
To: Aasmund Midttun Godal <postgresql@envisity.com>
Cc: josh@agliodbs.com
Cc: pgsql-sql@postgresql.org
Subject: Re: PL/pgSQL examples NOT involving functions
Date: Wed, 5 Dec 2001 16:26:47 -0500 (EST)
Message-ID: <200112052126.fB5LQlp01967@saturn.jw.home> (raw)
In-Reply-To: <20011127195917.10530.qmail@213-145-170-138.dd.nextgentel.com>
Aasmund Midttun Godal wrote:
> Erm, sorry about the multiple postings, I just discovered a couple of interesting tidbits after I posted first...
>
> http://www.postgresql.org/idocs/index.php?plpgsql.html :
>
> "The PL/pgSQL call handler parses the function's source text and produces an internal binary instruction tree the first time the function is called."
And that is still not entirely accurate. At the first
function call the control language (IF, WHEN, etc.) is
parsed. All expressions and queries are just remembered as
strings with variables replaced by $n parameters. Now every
statement will prepare a saved plan the first time it is hit.
So when you have a function with conditional code and a
specific branch of that code is never called, the statements
in there will never be prepared.
Jan
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To: pgsql-docs@postgresql.org
Cc: janwieck@yahoo.com, postgresql@envisity.com, josh@agliodbs.com, pgsql-sql@postgresql.org
Subject: Re: PL/pgSQL examples NOT involving functions
In-Reply-To: <200112052126.fB5LQlp01967@saturn.jw.home>
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