final Scanner substring_scanner = client.newScanner(table);
substring_scanner.setStartKey("fc1");
substring_scanner.setStopKey("fc4");
substring_scanner.setFilter(
new RowFilter(CompareOp.EQUAL, new SubstringComparator("2")));
final ArrayList<ArrayList<KeyValue>> substring_rows =
substring_scanner.nextRows().join();
assertSizeIs(1, substring_rows);
assertSizeIs(1, substring_rows.get(0));
assertEq("v2", substring_rows.get(0).get(0).value());