Simon Riggs <simon@2ndquadrant.com> writes:
> I have a complex query where making a small change to the SQL increases
> run-time by > 1000 times.
> The first SQL statement is of the form
> A JOIN B ON (a.id = b.id) LEFT JOIN C ON (a.id = c.id)
> and the second is like this
> A JOIN B ON (a.id = b.id) LEFT JOIN C ON (b.id = c.id)
> the only difference is the substitution of a -> b
Please provide an actual test case.
regards, tom lane