DRILL-8486: fix handling of long variable length entries during bulk … #3930

Job	Run time
Run checkstyle and generate protobufs	16m 27s
Run checkstyle and generate protobufs	16m 27s
Main Build (8, default-hadoop)	1h 35m 52s
Main Build (8, default-hadoop)	1h 35m 52s
Main Build (11, default-hadoop)	1h 25m 39s
Main Build (11, default-hadoop)	1h 25m 39s
Main Build (17, default-hadoop)	1h 14m 25s
Main Build (17, default-hadoop)	1h 14m 25s
Main Build (8, hadoop-2)	1h 1m 40s
Main Build (8, hadoop-2)	1h 21m 49s
	11h 28m 15s

Provide feedback