Run empty values node simplify optimizer after connector optimizer

Author: feilong-liu

presto-main-base/src/main/java/com/facebook/presto/sql/planner/PlanOptimizers.java

@@ -957,6 +957,9 @@ public PlanOptimizers(
                         costCalculator,
                         ImmutableSet.of(new RemoveRedundantIdentityProjections(), new PruneRedundantProjectionAssignments())));
 
+        // Pass after connector optimizer, as it relies on connector optimizer to identify empty input tables and convert them to empty ValuesNode
+        builder.add(new SimplifyPlanWithEmptyInput());
+
         // DO NOT add optimizers that change the plan shape (computations) after this point
 
         // Precomputed hashes - this assumes that partitioning will not change