Update test

Author: alamb

datafusion/optimizer/src/simplify_expressions/simplify_exprs.rs

@@ -375,7 +375,7 @@ mod tests {
         assert_optimized_plan_equal!(
             plan,
             @r"
-        Projection: sum(test.a) + Int64(2) * count(test.a) AS sum(test.a + Int64(2)), sum(test.a) + Int64(3) * count(test.a) AS sum(test.a + Int64(3))
+        Projection: sum(test.a) + Int64(2) * CAST(count(test.a) AS Int64) AS sum(test.a + Int64(2)), sum(test.a) + Int64(3) * CAST(count(test.a) AS Int64) AS sum(test.a + Int64(3))
           Aggregate: groupBy=[[]], aggr=[[sum(test.a), count(test.a)]]
             TableScan: test
         "