Fix for OR operation in complex filter.

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

@@ -329,10 +329,10 @@ public class DefaultEntityQueryRepository implements EntityQueryRepository {
         String entityFieldsQuery = EntityKeyMapping.buildQuery(ctx, entityFieldsFilters, entityFilter.getType());
         String result = permissionQuery;
         if (!entityFilterQuery.isEmpty()) {
-            result += " and " + entityFilterQuery;
+            result += " and (" + entityFilterQuery + ")";
         }
         if (!entityFieldsQuery.isEmpty()) {
-            result += " and " + entityFieldsQuery;
+            result += " and (" + entityFieldsQuery + ")";
         }
         return result;
     }

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

@@ -481,13 +481,13 @@ public class EntityKeyMapping {
                 stringOperationQuery = String.format("%s like :%s) or (%s is null and :%s = '%%')", operationField, paramName, operationField, paramName);
                 break;
             case CONTAINS:
-                if (value.length()>1) {
+                if (value.length()>0) {
                     value = "%" + value + "%";
                 }
                 stringOperationQuery = String.format("%s like :%s) or (%s is null and :%s = '')", operationField, paramName, operationField, paramName);
                 break;
             case NOT_CONTAINS:
-                if (value.length()>1) {
+                if (value.length()>0) {
                     value = "%" + value + "%";
                 }
                 stringOperationQuery = String.format("%s not like :%s) or (%s is null and :%s != '')", operationField, paramName, operationField, paramName);