seddonm1 commented on pull request #9376:
URL: https://github.com/apache/arrow/pull/9376#issuecomment-770464465


   > @jorgecarleitao -- I agree with @Dandandan -- think `date_trunc(scalar, 
array)` and `date_trun(scalar, scalar) are the really important cases. I have 
no use case for `date_trunc(array, array)`
   
   Having been trying to implement a lot of the Postgres logic recently they 
all logically support the use of arrays for each of the parameters (i.e. 
`date_trunc(array, array)`) I have no idea how common the use of this 
functionality really is - and I suspect it is low - but if we are building the 
API for Postgres compatibility it would be good to solve.


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