Should Cast(UTF-8 AS Timestamp) apply local time zone?

[waitingkuo]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

dataufusion v10.0.0's applies local time zone (i'm in UTC+8)

❯ select cast('2000-01-01T00:00:00' as timestamp);
+------------------------------------------------------------------+
| CAST(Utf8("2000-01-01T00:00:00") AS Timestamp(Nanosecond, None)) |
+------------------------------------------------------------------+
| 1999-12-31 16:00:00                                              |
+------------------------------------------------------------------+
1 row in set. Query took 0.004 seconds.

while postgresql's is not

willy=# select cast('2000-01-01T00:00:00' as timestamp);
      timestamp      
---------------------
 2000-01-01 00:00:00
(1 row)

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[waitingkuo]

depends on apache/arrow-rs#1936

[alamb]

I wonder if this item is now complete

[waitingkuo]

the original issue is fixed now

❯ select '2000-01-01T00:00:00'::timestamp;
+-----------------------------+
| Utf8("2000-01-01T00:00:00") |
+-----------------------------+
| 2000-01-01T00:00:00         |
+-----------------------------+
1 row in set. Query took 0.002 seconds

however it's not yet totally aligned with postgrseql
datafusion

❯ select '2000-01-01T00:00:00+01:00'::timestamp;
+-----------------------------------+
| Utf8("2000-01-01T00:00:00+01:00") |
+-----------------------------------+
| 1999-12-31T23:00:00               |
+-----------------------------------+
1 row in set. Query took 0.002 seconds.

postgresql

willy=# select '2000-01-01T00:00:00+01:00'::timestamp;
      timestamp      
---------------------
 2000-01-01 00:00:00
(1 row)

Looks like Postgresql's behavior is to completely ignore the timezone part while casting string to timestamp