void fill(boolean deleted) {
      fill(deleted ? 1 : 0);
    }
Calculates the min/max record key.
Structure in data is like this:
<op, owid, writerId, rowid, cwid, <f1, ... fn>>
The +1 is to account for the top level struct which has a
ColumnStatistics object in colsStats.  Top level struct is normally
dropped by the Reader (I guess because of orc.impl.SchemaEvolution)
@param colStats The statistics array
@return The min record key
ql/src/java/org/apache/hadoop/hive/ql/io/orc/VectorizedOrcAcidRowBatchReader.java