On 9/20/17 12:06, Tom Lane wrote:
> I'm tempted to propose that we invent some kind of "unknown"
> collation, which the planner would have to be taught to not equate to any
> other column collation (not even other instances of "unknown"), and that
> postgres_fdw's IMPORT ought to label remote columns with that collation
> unless specifically told to do otherwise. Then it's on the user's head
> if he tells us to do the wrong thing; but we won't produce incorrect
> plans by default.
OID 0 might already work that way, depending on the details.
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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