The following review has been posted through the commitfest application:
make installcheck-world: tested, failed
Implements feature: tested, passed
Spec compliant: not tested
Documentation: tested, passed
This is a midway review, a later will complete it.
The patch applies against 8d1f239003d0245dda636dfa6cf0add13bee69d6 and builds correctly. Make installcheck-world fails, but it seems to be somewhere totally unrelated (TCL pl)...
The documentation is very well-written and the patch implements the documented syntax.
I still need to check against the standard and I will run it against a non-trivival production load... hopefully I will finish up my review shortly after the weekend...