Re: CLUSTER on partitioned index

On Mon, Jan 18, 2021 at 12:34:59PM -0600, Justin Pryzby wrote:
> On Sat, Nov 28, 2020 at 08:03:02PM -0600, Justin Pryzby wrote:
> > On Sun, Nov 15, 2020 at 07:53:35PM -0600, Justin Pryzby wrote:
> > > On Wed, Nov 04, 2020 at 08:23:56PM -0600, Justin Pryzby wrote:
> > > > On Tue, Oct 27, 2020 at 07:33:12PM -0500, Justin Pryzby wrote:
> > > > > I'm attaching a counter-proposal to your catalog change, which preserves
> > > > > indisclustered on children of clustered, partitioned indexes, and invalidates
> > > > > indisclustered when attaching unclustered indexes.
> > > >
> > > > ..and now propagates CLUSTER ON to child indexes.
> > > >
> > > > I left this as separate patches to show what I mean and what's new while we
> > > > discuss it.
> > >
> > > This fixes some omissions in the previous patch and error in its test cases.
> > >
> > > CLUSTER ON recurses to children, since I think a clustered parent index means
> > > that all its child indexes are clustered. "SET WITHOUT CLUSTER" doesn't have
> > > to recurse to children, but I did it like that for consistency and it avoids
> > > the need to special case InvalidOid.
> >
> > The previous patch failed pg_upgrade when restoring a clustered, parent index,
> > since it's marked INVALID until indexes have been built on all child tables, so
> > CLUSTER ON was rejected on invalid index.
> >
> > So I think CLUSTER ON needs to be a separate pg_dump object, to allow attaching
> > the child index (thereby making the parent "valid") to happen before SET
> > CLUSTER on the parent index.
>
> Rebased on b5913f612 and now a3dc92600.

This resolves ORDER BY test failure with COLLATE "C".

--
Justin