public void deleteColumn(String storeName, String rowKey, String columnName) {
        m_columnDeletes.add(new ColumnDelete(storeName, rowKey, columnName));
    }
public void deleteColumn ( String storeName , String rowKey , String columnName ) { m_columnDeletes . add ( new ColumnDelete ( storeName , rowKey , columnName ) ) ; }
Add an update that will delete the column for the given store, row key, and column
name. If a column update exists for the same store/row/column, the results are
undefined when the transaction is committed.

@param storeName Name of store that owns row.
@param rowKey    Row key in string form.
@param colName   Column name in string form.