Fixed the bug, ref #312

...ities/src/main/java/at/tuwien/entities/database/View.java

...rc/main/java/at/tuwien/entities/database/table/Table.java

...t/tuwien/entities/database/table/columns/TableColumn.java

...tadata-db/test/src/main/java/at/tuwien/test/BaseTest.java

dbrepo-query-service/pom.xml

...t/java/at/tuwien/service/QueryServiceIntegrationTest.java

.../services/src/main/java/at/tuwien/mapper/QueryMapper.java

...rc/main/java/at/tuwien/service/impl/QueryServiceImpl.java