public R getMinimum() {
        return min;
      }
It gives the minimum value of a column for a given column family for the given range. In case
qualifier is null, a min of all values for the given family is returned.
@param table table to scan.
@param ci    the user's ColumnInterpreter implementation
@param scan  the HBase scan object to use to read data from HBase
@return min val &lt;R&gt;
@throws Throwable The caller is supposed to handle the exception as they are thrown &amp;
                  propagated to it.
hbase-endpoint/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java