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Select only one column

Merged Martin Weise requested to merge 135-query-execution-fails-when-selecting-only-the-id-column into dev

The bug was raised from a very deep underlying issue of wrong metadata db entities, a summary:

  • Since the implementation favors the .sql over the entities this is not a bug in production
  • The entities however are wrongly configured, it starts with the ColumnConcept.java as join-table of TableColumn.java and Concept.java (fixed)
  • The entities also cannot propagate the children since they depend on a primary key from the parent (not fixed)
  • The QueryMapper.java class does therefore not receive columns in all cases (fixed)
  • I added a ColumnParseException.java to reflect a custom exception and catch the vendor exception (fixed)
  • There is still a lot to do with documentation of the interfaces, they miss a lot of @throws and description (not fixed)
  • The unit tests need a specific order in which the entities are inserted into the H2 database (that mocks the metadata database) to work properly since the entities are flawed (fixed in 2 cases)

Closes #135

Edited by Martin Weise