Indicate progress only if limit is applied

The code was always returning an indication that it could benefit
from the limit pushdown even if that wasn't the case. This could
cause the optimizer to loop indefinitely in some cases.

presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryMetadata.java

@@ -356,10 +356,12 @@ public Optional<LimitApplicationResult<ConnectorTableHandle>> applyLimit(Connect
     {
         MemoryTableHandle table = (MemoryTableHandle) handle;
 
-        if (!table.getLimit().isPresent() || limit < table.getLimit().getAsLong()) {
-            table = new MemoryTableHandle(table.getId(), OptionalLong.of(limit));
+        if (table.getLimit().isPresent() && table.getLimit().getAsLong() <= limit) {
+            return Optional.empty();
         }
 
-        return Optional.of(new LimitApplicationResult<>(table, true));
+        return Optional.of(new LimitApplicationResult<>(
+                new MemoryTableHandle(table.getId(), OptionalLong.of(limit)),
+                true));
     }
 }