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Fix an Assert that turns out to be reachable after all.
estimate_num_groups() gets unhappy withcreate table empty();select * from empty except select * from empty e2;I can't see any actual use-case for such a query (and the table is illegalper SQL spec), but it seems like a good idea that it not cause an assertfailure.1 parent785d499 commitbe9aad6
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