"Paragon Corporation" <l...@pcorp.us> writes:
>> So I am guessing you guys are filtering the list so that it works for 
>> all FDWs even if the FDW author doesn't directly handle LIMIT / EXCEPT

> Yes.  The FDW author is not expected to implement those clauses; where do
you see documentation saying otherwise?

                        > regards, tom lane

I didn't. I was copying the postgres_fdw and noticed it implemented them

Is there an issue with handling it ahead of time?  In the case of ogr_fdw,
there is an extra call after getting list of tables to get the data
structure for a specific table,
So I thought implementing it directly would save some cycles, especially
since some data sources require inspection of the data to infer the
structure so could be very expensive.


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