public void initInsertRow() {
        for (int i = 0; i < cols; i++) {
            colsInserted.clear(i);
        }
    }
Clears all the bits in the internal <code>BitSet</code> object
maintained by this <code>InsertRow</code> object.  Clearing all the bits
indicates that none of the columns have had a value inserted.
src/main/java/org/replicadb/rowset/sun/rowset/internal/InsertRow.java