private void setLastValueNull(boolean value) {
        lastValueNull = value;
    }
Sets the field <code>lastValueNull</code> to the given
<code>boolean</code> value.

@param value <code>true</code> to indicate that the value of
       the last column read was SQL <code>NULL</code>;
       <code>false</code> to indicate that it was not
src/main/java/org/replicadb/rowset/sun/rowset/CachedRowSetImpl.java