AcKing-Sam commented on PR #32518:
URL: https://github.com/apache/doris/pull/32518#issuecomment-2020035424

   @yiguolei  @zhiqiang-hhhh 
   
   Hi, I added the cast from datetime to decimal. Also, I modified the logic in 
`cast_to_decimals()`.
   However, there is an exception, to test this SQL:
   `select cast(a as decimal(30, 9)) from (select cast("9999-12-31 
23:59:59.999" as datetime) a) t1;`
   
   In Doris, it directly get the exception:
   `Conversion from Nullable(DateTimeV2) to Decimal(30, 9) is not supported.`
   
   It looks like the cast from string to datetime cannot make sure the 
accuracy. Due to this reason, this sql tries to cast a `NULL` to decimal.
   I think the continuous problem (**accuracy from string to datetime**) can be 
handled in another issue. 


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