I was able to test the functionality (which seemed to work fine) and fed in my comment to assist anyone else reviewing this patch (and intentionally let it's state as 'Needs Review').
While trying to provide my feedback, on hindsight I should have been more detailed about what I didn't test. Being my first review, I didn't understand that not checking a box meant 'failure'. For e.g. I read the sgml changes, which felt okay but didn't click 'Passed' because my env wasn't setup properly.
I've set this back to 'Needs Review' because clearly needs it.
The following review has been posted through the commitfest application: make installcheck-world: not tested Implements feature: tested, failed
Where ?
Spec compliant: not tested Documentation: tested, failed
Where ? I just regenerated the html doc on the patch without a glitch.
The patch applies cleanly and compiles + installs fine (although am unable to do installcheck-world on my Cygwin setup). This is how the patch works on my setup.
$ /opt/postgres/reviewpatch/bin/psql -U postgres -h localhost psql (11devel, server 9.6.1) Type "help" for help.
postgres=# \set i 1 postgres=# \if :{?i} postgres=# \echo 'testing' testing postgres=# \endif postgres=# \if :{?id} postgres@# \echo 'testing' \echo command ignored; use \endif or Ctrl-C to exit current \if block postgres@# \endif postgres=#
ISTM that this is the expected behavior.
In the first case, "i" is defined, so the test is true and the echo echoes.
In the second case, "id" is undefined, the test is false and the echo is skipped.
I do not understand why you conclude that the feature "failed".