Forcing materialize in the planner

Have you tried putting those components in a common table expression?
I'm not sure if it absolutely forces the materialization or not, but in
practice that has been my experience.

Robert James wrote:

I have a query which, when I materialize by hand some of its
components, runs 10x faster (including the time needed to
materialize). Is there any way to force Postgres to do that? Or do I
need to do this by hand using temp tables?

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