comphead commented on issue #8336:
URL: 
https://github.com/apache/arrow-datafusion/issues/8336#issuecomment-1828765504

   > > The overflow happens because Datafusion treats underlying i64 as 
nanoseconds which is obviously not big enough.
   > 
   > I'm confused by this statement, DataFusion follows the arrow data model 
which has various different timestamp precisions. There is no hard coded 
mapping to nanoseconds, rather anything from seconds to nanoseconds is supported
   
   Right, I can see there are bunch of hardcodes to nanoseconds, like cast from 
string to timestamp will come as nanoseconds, read from parquet, coercions, etc.


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