Re: [BUGS] casting strings to multidimensional arrays yields strange results

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Joe Conway <mail(at)joeconway(dot)com>
Cc: Kris Jurka <books(at)ejurka(dot)com>, "Patches (PostgreSQL)" <pgsql-patches(at)postgresql(dot)org>
Subject: Re: [BUGS] casting strings to multidimensional arrays yields strange results
Date: 2004-08-05 04:19:40
Message-ID: 14225.1091679580@sss.pgh.pa.us
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Joe Conway <mail(at)joeconway(dot)com> writes:
> While looking at it the last day or so, I started to think it might be
> better to use bison to parse array literals -- or is that a bad idea?

Offhand it doesn't seem like a super-appropriate tool. Once you get
past the lexical details like quoting, the syntax of array literals
is not complicated enough to need a bison parser. Also, the issues
you're facing now like enforcing consistent dimensions are not amenable
to solution by a context-free grammar --- so you'd still need most of
the dimension-checking mechanisms.

There might be something out there that is more useful, but I dunno
what.

regards, tom lane

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