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https://issues.apache.org/jira/browse/CASSANDRA-5882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750165#comment-13750165
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Aleksey Yeschenko commented on CASSANDRA-5882:
----------------------------------------------
+1
> Changing column type from int to bigint or vice versa causes decoding errors.
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-5882
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5882
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: J.B. Langston
> Assignee: Sylvain Lebresne
> Fix For: 1.2.9
>
> Attachments: 5882.txt
>
>
> cqlsh:dbsite> create table testint (id uuid, bestof bigint, primary key (id)
> );
> cqlsh:dbsite> insert into testint (id, bestof ) values
> (49d30f84-a409-4433-ad60-eb9c1a06b7bb, 1376399966);
> cqlsh:dbsite> insert into testint (id, bestof ) values
> (6cab4798-ad29-4419-bd59-308f9ec3bc44, 1376389800);
> cqlsh:dbsite> insert into testint (id, bestof ) values
> (685bb9ff-a4fe-4e47-95eb-f6a353d9e179, 1376390400);
> cqlsh:dbsite> insert into testint (id, bestof ) values
> (a848f832-5ded-4ef7-bf4b-7db561564c57, 1376391000);
> cqlsh:dbsite> select * from testint ;
> id | bestof
> --------------------------------------+------------
> a848f832-5ded-4ef7-bf4b-7db561564c57 | 1376391000
> 49d30f84-a409-4433-ad60-eb9c1a06b7bb | 1376399966
> 6cab4798-ad29-4419-bd59-308f9ec3bc44 | 1376389800
> 685bb9ff-a4fe-4e47-95eb-f6a353d9e179 | 1376390400
> cqlsh:dbsite> alter table testint alter bestof TYPE int;
> cqlsh:dbsite> select * from testint ;
> id | bestof
> --------------------------------------+-----------------------------
> a848f832-5ded-4ef7-bf4b-7db561564c57 | '\x00\x00\x00\x00R\n\x0fX'
> 49d30f84-a409-4433-ad60-eb9c1a06b7bb | '\x00\x00\x00\x00R\n2^'
> 6cab4798-ad29-4419-bd59-308f9ec3bc44 | '\x00\x00\x00\x00R\n\n\xa8'
> 685bb9ff-a4fe-4e47-95eb-f6a353d9e179 | '\x00\x00\x00\x00R\n\r\x00'
> Failed to decode value '\x00\x00\x00\x00R\n\x0fX' (for column 'bestof') as
> int: unpack requires a string argument of length 4
> Failed to decode value '\x00\x00\x00\x00R\n2^' (for column 'bestof') as int:
> unpack requires a string argument of length 4
> 2 more decoding errors suppressed.
> I realize that going from BIGINT to INT would cause overflow if a column
> contained a number larger than 2^31-1, it is at least technically possible to
> go in the other direction. I also understand that rewriting all the data in
> the correct format would be a very expensive operation on a large column
> family, but if that's not something we want to allow we should explicitly
> disallow changing data types if the table has any rows.
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