partitionHelper.setPartitionFilterExpression(
"year<='2010' and month=='01' and day>='01'", PigStorage.class, "2");
partitionHelper.setPartitionKeys(baseDir.getAbsolutePath(), conf,
PigStorage.class, "2");
List<FileStatus> files = partitionHelper.listStatus(jobContext,
PigStorage.class, "2");
assertNotNull(files);
assertEquals(1, files.size());