INTERVAL '10' MINUTE))
TABLE ORDERS is converted to SqlPrefixOperator, but DESCRIPTOR(ROWTIME) has no mapping in SqlStdOperatorTable.
There are two options:
1. There is a SqlColumnListConstructor which serves the same(similar) purpose to specific a list of column.
2. We create a new operator for DESCRIPTOR.
Reuse existing code is always good so we can start from option one and see if it works.