[Issue #105]: fix endless execution for select count(*).
#106
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Fix the endless execution of
select count(*) from tand queries with predicate '=null' (although such predicate is meaningless).Query with '=null' predicate will return 0 rows in Presto, while the number of scanned rows is the same as result of
select count(*) from t, which is the total number of rows int.select count(*) from twill only touch the file footers.