@Explain(displayName = "Write Type")
  public String getWriteTypeString() {
    //if acid write, add to plan output, else don't bother
    return getWriteType() == AcidUtils.Operation.NOT_ACID ? null : getWriteType().toString();
  }
Need to remember whether this is an acid compliant operation, and if so whether it is an
insert, update, or delete.
ql/src/java/org/apache/hadoop/hive/ql/plan/LoadDesc.java