@Override
public String rewriteFilterItem(FilterItem item) {
SelectItem _selectItem = item.getSelectItem();
Object _operand = item.getOperand();
OperatorType _operator = item.getOperator();
if (null != _selectItem && _operand != null) {
ColumnType columnType = _selectItem.getExpectedColumnType();
if (columnType != null) {
if (columnType.isTimeBased()) {
// special logic for DB2 based time operands.