comphead commented on issue #4761:
URL:
https://github.com/apache/arrow-datafusion/issues/4761#issuecomment-1370193596
@liukun4515 another query in PG I believe give some clue
```
select pg_typeof(least(now(), '2021-1-1'::date))
pg_typeof
--
timestamp with time zone
```
That presumes the cast happens through timestamp as you and @alamb deducted.
The same behaviour in spark
```
scala> spark.sql("select least(current_timestamp, date
'2021-1-1')").printSchema
root
|-- least(current_timestamp(), DATE '2021-01-01'): timestamp (nullable =
false)
```
let me know if you think its enough to make a PR
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