I think your proposal will support CarbonSession also, but not only SDK and 
FileFormat, right?

Regards,
Jacky

> 在 2018年9月14日,下午12:34,Kunal Kapoor <kunalkapoor...@gmail.com> 写道:
> 
> Hi xuchuanyin,
> Yes your understanding is correct and i agree that documentation has to be
> updated to mention that for old store double data type should be used.
> For the first phase let us focus on writing/reading through SDK and
> FileFormat.
> What are your thoughts?
> 
> On Fri, Sep 14, 2018 at 7:05 AM xuchuanyin <xuchuan...@hust.edu.cn> wrote:
> 
>> The actual storage datatype for that column is stored in ColumnPage level.
>> In previous implementation, columns with literal datatype 'float' and
>> 'double' shared the same storage datatype 'double' and you want to
>> distinguish them by adding support for storage datatype 'float'.
>> 
>> Is my understanding right? If it is so, there will no compatible problems.
>> But we'd better to mention that for old store prior than 1.5.0, user can
>> only use double.
>> 
>> 
>> 
>> --
>> Sent from:
>> http://apache-carbondata-dev-mailing-list-archive.1130556.n5.nabble.com/
>> 
> 



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