Hi Hequn,
Thanks a lot for your anwswer! The question is clear now.
Best
Henry
> 在 2018年8月14日，下午1:24，Hequn Cheng <chenghe...@gmail.com
> <mailto:chenghe...@gmail.com>> 写道：
>
> Hi Henry,
>
> Flink does support rename column after casting.
>
> The exception is not caused by cast. It is caused by mixing of types, for
> example, the query
> "CASE 1 WHEN 1 THEN true WHEN 2 THEN 'string' ELSE NULL END"
> will throw the same exception since type of true and 'string' are not same.
>
> Best, Hequn.
>
> On Tue, Aug 14, 2018 at 12:51 PM, 徐涛 <happydexu...@gmail.com
> <mailto:happydexu...@gmail.com>> wrote:
> Hi All,
> I am working on a project based on Flink SQL, but found that I can`t
> rename column after casting, the code is as below:
> cast(json_type as INTEGER) as xxx
>
> And the following exception is reported:
> org.apache.calcite.runtime.CalciteContextException: From line 4,
> column 6 to line 11, column 38: Illegal mixing of types in CASE or COALESCE
> statement
>
> I want to know that does Flink do not support this function because I
> think it is a common case? Is there a way to accomplish this function?
> Thank a lot.
>
> Best
> Henry Xu
>
