On Fri, 2012-05-04 at 16:12 -0400, Tom Lane wrote:
> Robert Haas <robertmh...@gmail.com> writes:
> > On Fri, May 4, 2012 at 3:49 PM, Hannu Krosing <ha...@krosing.net> 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.

> It is possible that that can be made to work, but it's a research
> project, not something to be crammed into 9.2 at the last possible
> minute.  In any case, I really dislike the idea that array_to_json
> and row_to_json would contain two entirely different behaviors.
> Leave the extensibility ideas for a future to_json() function.

I did not mean that array_to_json and row_to_json would be different
than the generic to_json, just that they would be thin wrappers around
the to_json function which check that the arguments are of the correct
types for casting to "JSON text". 

They need to recurse to each other and generic to_json anyway.

>                       regards, tom lane

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

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