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From aaron morton <aa...@thelastpickle.com>
Subject Re: Can column type be changed dynamically?
Date Mon, 30 Apr 2012 04:06:55 GMT
That sounds right to me. 

A
-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 29/04/2012, at 5:00 AM, Paolo Bernardi wrote:

> Apparently IntegerType is based on Java's BigInteger.
> 
> http://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=blob_plain;f=src/java/org/apache/cassandra/db/marshal/IntegerType.java;hb=HEAD
> 
> Given the message, I suspect that you got some values between -2^15 and 2^15-1 (the range
of a short int) that have been serialized with two bytes. Any confirmation on this?
> 
> If this is true, changing the type like you tried to do might not be so straightforward.
> 
> Paolo
> 
> On Apr 27, 2012 6:55 PM, "马超" <hosschao@gmail.com> wrote:
> After I update the column type:
> 
> update column family User with column_metadata = [{column_name : 77, validation_class
: Int32Type}];
> 
> I can't list the data in User column family:
> 
> list User;
> 
> RowKey: 1234
> A int is exactly 4 bytes: 2
> 
> Any ideas for this?
> 
> Thanks,
> 
> 2012/4/27 马超 <hosschao@gmail.com>
> Thanks a lot!
> I will go ahead~
> 
> 
> 2012/4/27 Sylvain Lebresne <sylvain@datastax.com>
> On Fri, Apr 27, 2012 at 5:26 PM, 马超 <hosschao@gmail.com> wrote:
> > Hi all,
> >
> > I want to change one of my column type from IntegerType to Int32Type
> > dynamically. I'm sure all datas in that column are int32 type indeed. So I
> > want changing the column type by:
> >
> > update column family XXX with column_metadata = [{column_name : 'xxx',
> > validation_class : Int32Type}];
> >
> > Is there any harm to do this?
> 
> There isn't (as long as you're right to be sure of course).
> 
> --
> Sylvain
> 
> 


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