Performance improvement for queries with no results

dao/src/main/java/org/thingsboard/server/dao/sql/query/DefaultEntityQueryRepository.java

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -315,6 +315,9 @@ public class DefaultEntityQueryRepository implements EntityQueryRepository {
             String countQuery = String.format("select count(id) %s", fromClauseCount);
             int totalElements = jdbcTemplate.queryForObject(countQuery, ctx, Integer.class);
 
+            if (totalElements == 0) {
+                return new PageData<>();
+            }
             String dataQuery = String.format("select * %s", fromClauseData);
 
             EntityDataSortOrder sortOrder = pageLink.getSortOrder();