Merge branch 'refactor' of github.com:polypheny/Polypheny-DB into ref… #3760

Job	Run time
Integration Tests (Java 11) (mongodb)	1h 17m 29s
Integration Tests (Java 11) (hsqldb)	58m 39s
Integration Tests (Java 11) (monetdb)	1h 7m 43s
Integration Tests (Java 11) (postgresql)	1h 18m 22s
Integration Tests (Java 11) (file)	49m 9s
Integration Tests (Java 11) (cottontail)	58m 1s
Integration Tests (Java 11) (neo4j)	1h 36m 0s
	8h 5m 23s

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