public long getFileLength() {
    return fileLen;
  }
@return {@code true} if file schema doesn't have Acid metadata columns
Such file may be in a delta_x_y/ or base_x due to being added via
"load data" command.  It could be at partition|table root due to table having
been converted from non-acid to acid table.  It could even be something like
"warehouse/t/HIVE_UNION_SUBDIR_15/000000_0" if it was written by an
"insert into t select ... from A union all select ... from B"
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcSplit.java