IncrementalReader reader = new IncrementalReader(masterConn,
"SELECT '1', '2', '3', val1, * FROM foo", 1);
MappingData columnMapping = reader.getColumnMapping();
columnMapping.setDataMapper(0, new IntegerDataMapper());
columnMapping.setDataMapper(1, new IntegerDataMapper());
columnMapping.setDataMapper(2, new StringDataMapper());
columnMapping.setDataMapper(3, new TimestampDataMapper());
Object[] columns = reader.getNextColumns();
assertNotNull(columns);
assertEquals(7, columns.length);