On Tue, Dec  4, 2012 at 05:35:27PM -0500, Tom Lane wrote:
> Alvaro Herrera <alvhe...@2ndquadrant.com> writes:
> > Maybe we can mark GIN indexes as invalid after pg_upgrade somehow, so
> > that they require reindex in the new cluster before they can be used for
> > queries or index updates.
> Bumping the version number in the GIN metapage would be sufficient.

And it is easy for pg_upgrade to report which indexes need rebuilding,
and it can create a script file to do the reindexing.

  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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