Peter Geoghegan <peter(at)2ndquadrant(dot)com> writes:
> I noticed this typo in a comment in the file nbtsort.c:
> /*
> * We need to log index creation in WAL iff WAL archiving/streaming is
> * enabled UNLESS the index isn't WAL-logged anyway.
> */
> I suggest an s/iff/if/
This is not a typo, it's the standard contraction for "if and only if".
regards, tom lane