Re: [PATCH] Use $ parameters as replacement characters for pg_stat_statements

Pushed with minor adjustments.

The main non-cosmetic thing I did was to replace the floor(log10())
business with plain constant "10" as I suggested before.  That's
what we do in other places --- see int4out for an example --- and
frankly I did not feel that a small space savings in a transient
string buffer was worth the intellectual effort to verify whether
that calculation was correct or not, never mind whatever runtime
cycles it would take.  I don't believe the argument that it's safer
your way: if you had an off-by-one thinko in the calculation, or even
just roundoff error in the log10() call, it could result in an actual
reachable buffer overrun, because there's no safety margin.