a1bde80db4
It's not clear if this situation can occur in plpgsql other than via the EXECUTE USING case Heikki illustrated, which I will shortly close off. However, ignoring the intoClause if it's there is surely wrong, so let's patch it for safety. Backpatch to 8.3, which is as far back as this code has a PlannedStmt to deal with. There might be another way to make an equivalent test before that, but since this is just preventing hypothetical bugs, I'm not going to obsess about it.
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