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date_part does't work for now() #3096

@waitingkuo

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@waitingkuo

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To Reproduce
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select date_part('hour', now());
Plan("Coercion from [Utf8, Timestamp(Nanosecond, Some(\"UTC\"))] to the signature OneOf([Exact([Utf8, Date32]), Exact([Utf8, Date64]), Exact([Utf8, Timestamp(Second, None)]), Exact([Utf8, Timestamp(Microsecond, None)]), Exact([Utf8, Timestamp(Millisecond, None)]), Exact([Utf8, Timestamp(Nanosecond, None)])]) failed.")

note that it could be fixed by

select date_part('hour', now()::timestamp);
+-------------------------------------------------------------------+
| datepart(Utf8("hour"),CAST(now() AS Timestamp(Nanosecond, None))) |
+-------------------------------------------------------------------+
| 6                                                                 |
+-------------------------------------------------------------------+
1 row in set. Query took 0.000 seconds.

the reason for that is now() output timestamp with time zone, but our date_part doesn't work for it

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