Tom Lane 5ab15591d9 eqjoinsel's logic for case where MCV lists are not present should
account for NULLs; in hindsight this is obvious since the code for
the MCV-lists case would reduce to this when there are zero entries
in both lists.  Per example from Alec Mitchell.
2003-04-15 05:18:12 +00:00
..
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