Excerpts from Tom Lane's message of vie jul 01 18:20:50 -0400 2011:
> Alvaro Herrera writes:
> > I also included rel.h in spi.h, because it was previously indirectly
> > included via execnodes.h and with this patch it would no longer be,
> > which is a problem because it'd cause external code to
Alvaro Herrera writes:
> This simple patch moves two struct declarations (Trigger and
> TriggerDesc) from rel.h into a new file, reltrigger.h. The benefit is
> that execnodes.h only needs to include the latter. Since execnodes.h is
> very widely included, this change means there are less files t
