DDC-2953 - stubbing out failing test case
DDC-2953 - Fixed tests, reproduced issue
DDC-2953 - schema creation is not needed
DDC-2953 - cleaning up tests
DDC-2953 - Applying hotfix fas of mariusz.jaskolka@comarch.pl's suggestion
DDC-2953 - removing unused array initialization
DDC-2953 - removing hacky storage of identifier groups indexes
DDC-2953 - identifier groups should be reset at each hydrator preparation