> > Changing the default opclasses should work if we make
> > pg_dump --binary-upgrade dump the default opclasses with indexes
> > and exclusion constraints.  I think it makes sense to do so in
> > --binary-upgrade mode.  I can try to come with a patch for this.
> Can you explain it a bit more detail? I didn't get it.

pg_upgrade uses pg_dump --binary-upgrade to dump the schema of
the old database.  Now, it generates CREATE INDEX statements without
explicit opclass if opclass is the default.  We can change pg_dump
to generate the statements with opclass even if opclass is the default
in --binary-upgrade mode.

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