Greg Stark <stark@mit.edu> writes:
> I'm a bit puzzled why we're so afraid of swapping the relfilenodes
> when that's what the current REINDEX does.
Swapping the relfilenodes is fine *as long as you have exclusive lock*.
The trick is to make it safe without that. It will definitely not work
to do that without exclusive lock, because at the instant you would try
it, people will be accessing the new index (by OID).
regards, tom lane