Re: min_safe_lsn column in pg_replication_slots view

On 2020-Jul-09, Alvaro Herrera wrote:

> I think we should define InvalidXLogSegNo to be ~((uint64)0) and add a
> macro to test for that.

That's overkill really.  I just used zero.  Running
contrib/test_decoding under valgrind, this now passes.

I think I'd rather do away with the compare to zero, and initialize to
something else in GetWALAvailability, though.  What we're doing seems
unclean and unclear.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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