Robert Haas wrote:
> On Thu, Jan 4, 2018 at 11:44 AM, Peter Eisentraut
> <peter.eisentraut@2ndquadrant.com> wrote:
> > I'm not sure why this feature of automatically picking up matching
> > indexes even exists. Is it for some specific workflows or upgrade
> > scenarios? It's kind of a surprising feature in a way.
>
> It allows you to avoid building a new indexes unnecessarily when
> attaching a partition.
Yeah -- this is important to reduce the duration of the DDL operation,
since attaching a partition requires an access exclusive lock. Having
to build the index at that point would make that feature pretty much
useless for many use cases.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
