On Mon, Jan 9, 2017 at 6:03 PM, Craig Ringer <craig@2ndquadrant.com> wrote:
> Immutable functions can and do use functionality from all over the
> server. They just don't depend on user-visible mutable _state_
> elsewhere in the server.
OK, fair point, but at least the functionality *could* be written without using
existing C functions, since its only the input that determine what
output will be returned. The dependencies used by the immutable
functions can also be ported, function by function, until there are
no dependencies.