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Re: Proposal: Add JSON support

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Mike Rylander <mrylander(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Joseph Adams <joeyadams3(dot)14159(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Proposal: Add JSON support
Date: 2010-03-29 00:46:11
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Lists: pgsql-hackers

Robert Haas wrote:
> On Sun, Mar 28, 2010 at 8:23 PM, Mike Rylander <mrylander(at)gmail(dot)com> wrote:
>> In practice, every parser/serializer I've used (including the one I
>> helped write) allows (and, often, forces) any non-ASCII character to
>> be encoded as \u followed by a string of four hex digits.
> Is it correct to say that the only feasible place where non-ASCII
> characters can be used is within string constants?  If so, it might be
> reasonable to disallow characters with the high-bit set unless the
> server encoding is one of the flavors of Unicode of which the spec
> approves.  I'm tempted to think that when the server encoding is
> Unicode we really ought to allow Unicode characters natively, because
> turning a long string of two-byte wide chars into a long string of
> six-byte wide chars sounds pretty evil from a performance point of
> view.

We support exactly one unicode encoding on the server side: utf8.

And the maximum possible size of a validly encoded unicode char in utf8 
is 4 (and that's pretty rare, IIRC).



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