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From: Joe Conway <mail@joeconway.com>
To: Markus Bertheau <twanger@bluetwanger.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Patches (PostgreSQL) <pgsql-patches@postgresql.org>
Subject: Re: [SQL] array_in: '{}}'::text[]
Date: Sat, 28 Aug 2004 15:41:27 -0700
Message-ID: <41310A17.5020405@joeconway.com> (raw)
In-Reply-To: <1093723759.2732.16.camel@teetnang>
References: <1093261555.2647.6.camel@dicaprio.akademie1.de>
	<412A384C.5000907@joeconway.com>
	<412F9BA5.8070009@joeconway.com>
	<14978.1093662341@sss.pgh.pa.us>
	<4130DE0F.7030207@joeconway.com>
	<1093723759.2732.16.camel@teetnang>

Markus Bertheau wrote:
> 
> Without looking at the code in a whole, you accept '{} ' as an empty
> array literal, so why is the special case for '{}' needed here?

It's a fast path for a common special case. Why spend any cycles parsing 
if we can immediately recognize it? However, anything other than a 
simple '{}' does require parsing.

Joe

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