public void setKeyColumns(int [] keys) throws SQLException {
        throw new UnsupportedOperationException();
    }
Sets this <code>CachedRowSetImpl</code> object's
<code>keyCols</code> field with the given array of column
numbers, which forms a key for uniquely identifying a row
in this rowset.

@param keys an array of <code>int</code> indicating the
       columns that form a primary key for this
       <code>CachedRowSetImpl</code> object; every
       element in the array must be greater than
       <code>0</code> and less than or equal to the number
       of columns in this rowset
@throws SQLException if any of the numbers in the
           given array is not valid for this rowset
@see #getKeyColumns
src/main/java/org/replicadb/rowset/sun/rowset/internal/SyncResolverImpl.java