Hi,
On 2018-06-13 09:18:21 +0900, Michael Paquier wrote:
> We map pg_wal_lsn_diff result to a numeric, so that could make sense to
> use numeric as well here, which is not the greatest choice by the way as
> that's an int64 internally, but that's more portable for any
> (unlikely-to-happen) future changes.
The reason to not use int64 is that it's signed. lsns are
unsigned. Therefore you couldn't represent all LSNs without wrapping
into negative.
Greetings,
Andres Freund
