started fixing cross model queries #3742

Job	Run time
Integration Tests (Java 11) (mongodb)	1h 35m 55s
Integration Tests (Java 11) (hsqldb)	1h 10m 27s
Integration Tests (Java 11) (monetdb)	1h 18m 15s
Integration Tests (Java 11) (postgresql)	1h 36m 5s
Integration Tests (Java 11) (file)	1h 36m 14s
Integration Tests (Java 11) (cottontail)	1h 17m 43s
Integration Tests (Java 11) (neo4j)	1h 17m 57s
	9h 52m 36s

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