@Override
  public boolean shouldSkipCombine(Path path,
                                   Configuration conf) throws IOException {
    return (conf.get(AcidUtils.CONF_ACID_KEY) != null) || AcidUtils.isAcid(null, path, conf);
  }
When picking the hosts for a split that crosses block boundaries,
drop any host that has fewer than MIN_INCLUDED_LOCATION of the
number of bytes available on the host with the most.
If host1 has 10MB of the split, host2 has 20MB, and host3 has 18MB the
split will contain host2 (100% of host2) and host3 (90% of host2). Host1
with 50% will be dropped.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java