On 29 August 2012 23:39, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> The main downside I can see is that code that used to work is likely
> to stop working as soon as someone creates a potential overloading
> situation. Worse, the error message could be pretty confusing, since
> if you had been successfully calling f(smallint) with f(42), you'd get
> "f(integer) does not exist", not something like "f() is ambiguous",
> after adding f(float8) to the mix. This seems related to the confusing
> changes in regression test cases that I got in my experiments yesterday.
> This may be sufficient reason to reject the idea, since the very last
> thing we need in this area is any degradation in the relevance of the
> error messages.
It would be useful if we issued a NOTICE when an ambiguity is
introduced, rather than when using it.
Like Bison's reporting of reduce conflicts.
-- Simon Riggs http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services
