DateTime and TimeStamp cannot use index when literals are in string format

[birdstorm]

We could change the literal string into timestamp type, or push down casted filter so that index could be used correctly.

e.g.,

select tp_datetime from t where tp_datetime between '2000-01-01 00:00:00' and timestamp '2001-01-01 00:00:00'

select tp_datetime from t where tp_datetime between '2018' and date '2019-01-01'

[shiyuhang0]

can we close it ?