>>>>> "Andres" == Andres Freund <and...@anarazel.de> writes:

 Andres> I think it's not unreasonable to think of it that way, but it's
 Andres> really not how it is used today. In pretty much all cases the
 Andres> collation is known and determined at the time fmgr_info() is
 Andres> called (we also commonly reuse FunctionCallInfoData structs).

The obvious case which is not one of those "pretty much all cases" is
where DirectFunctionCallN[Coll] is used - which turns out to be not all
that unusual.

-- 
Andrew (irc:RhodiumToad)

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