waitingkuo commented on issue #1992:
URL:
https://github.com/apache/arrow-datafusion/issues/1992#issuecomment-1263624087
just found that `date_part` has different return type in pg
```
date_part ( text, timestamp ) → double precision
Get timestamp subfield (equivalent to extract); see [Section
9.9.1](https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT)
date_part('hour', timestamp '2001-02-16 20:38:40') → 20
```
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