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(parent: 053835d) | patch

Ensure that INSERT ... SELECT into a table with OIDs never copies row OIDs

Ensure that INSERT ... SELECT into a table with OIDs never copies row OIDs
from the source table. This could never happen anyway before 8.4 because
the executor invariably applied a "junk filter" to rows due to be inserted;
but now that we skip doing that when it's not necessary, the case can occur.
Problem noted 2008年11月27日 by KaiGai Kohei, though I misunderstood what he
was on about at the time (the opacity of the patch he proposed didn't help).

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