Re: JSON in 9.2 - Could we have just one to_json() function instead of two separate versions ? - Mailing list pgsql-hackers

From Hannu Krosing
Subject Re: JSON in 9.2 - Could we have just one to_json() function instead of two separate versions ?
Date
Msg-id 1336224434.19151.238.camel@hvost
Whole thread Raw
In response to Re: JSON in 9.2 - Could we have just one to_json() function instead of two separate versions ?  (Peter Eisentraut <peter_e@gmx.net>)
List pgsql-hackers
On Sat, 2012-05-05 at 12:16 +0300, Peter Eisentraut wrote:
> On fre, 2012-05-04 at 15:59 -0400, Robert Haas wrote:
> > > Can we at least have the xxx_to_json() functions try cast to json
> > first
> > > and fall back to text if the cast fails.
> > 
> > I think the idea that you can involve the casting machinery in this is
> > misguided.  sometextval::json has got to mean that sometextval is
> > expected to be in the form of a syntactically correct JSON value - and
> > NOT that we wrap it in a JSON string.
> 
> I think it's only wrong if you try casting first and fall back to text.
> Otherwise it could work, if the set of all json casts is defined
> consistently.

Currently the default "cast" for non-number, non-bool, not-already-json,
non-null values is to wrap text representation in double quotes.

So casting first then fall back to _quoted_ text is wrong only for those
types which have a very ugly text representation :)

-- 
-------
Hannu Krosing
PostgreSQL Unlimited Scalability and Performance Consultant
2ndQuadrant Nordic
PG Admin Book: http://www.2ndQuadrant.com/books/



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