add cross join test

Author: goldmedal

datafusion/sqllogictest/test_files/join.slt.part

@@ -643,6 +643,10 @@ SELECT * FROM t1 RIGHT JOIN t2
 query error join condition should not be empty
 SELECT * FROM t1 FULL JOIN t2
 
+# cross join no need for join condition
+statement ok
+SELECT * FROM t1 CROSS JOIN t2
+
 # multiple inner joins with mixed ON clause and filter
 query III rowsort
 SELECT t1.t1_id, t2.t2_id, t3.t3_id