zhiqiang-hhhh commented on PR #32518:
URL: https://github.com/apache/doris/pull/32518#issuecomment-2022521875
> @zhiqiang-hhhh
>
> Hi, I wonder what is the correct answer of this sql: `select cast(a as
decimal(30, 4)) from (select cast("9999-12-31 23:59:59.999999" as datetime(6))
a) t1;`
>
> For MYSQL, the answer is:
>
> ```sql
> +---------------------------+
> | cast(a as decimal(30, 4)) |
> +---------------------------+
> | 99991231235960.0000 |
> +---------------------------+
> ```
>
> For my implementation, it is:
>
> ```sql
> +-----------------------------+
> | cast(a as DECIMALV3(30, 4)) |
> +-----------------------------+
> | 99991231235959.9999 |
> +-----------------------------+
> 1 row in set (0.02 sec)
> ```
There is something strange about behaviour of mysql, it is rounding but
finished halfway, and doris is just doing truncate.
I just tests pg and sql server ,they all have different behaviour.
I think we can just keep doing truncate, but we need more conner test to
make sure that we will do truncate in all situations like above.
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