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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13730) Dropping a table doesn't drop its dropped columns
Date Tue, 25 Jul 2017 20:36:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16100739#comment-16100739
] 

Aleksey Yeschenko commented on CASSANDRA-13730:
-----------------------------------------------

bq. Weren't the dropped columns just a map before 3.0?

Totally was. My memory is apparently garbage. Thanks.

> Dropping a table doesn't drop its dropped columns
> -------------------------------------------------
>
>                 Key: CASSANDRA-13730
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13730
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Duarte Nunes
>            Assignee: Aleksey Yeschenko
>             Fix For: 2.1.x, 2.2.x, 3.0.x, 3.11.x
>
>
> I'm not sure if this is intended or not, but currently a table's dropped columns are
not dropped when the table itself is dropped:
> {noformat}
> cqlsh> create keyspace ks WITH replication={ 'class' : 'SimpleStrategy', 'replication_factor'
: 1 } ;
> cqlsh> use ks;
> cqlsh:ks> create table  test (pk text primary key, c1 int);
> cqlsh:ks> alter table test drop c1;
> cqlsh:ks> drop table test;
> cqlsh:ks> select * from system_schema.dropped_columns where keyspace_name = 'ks' and
table_name = 'test';
>  keyspace_name | table_name | column_name | dropped_time                    | kind  
 | type
> ---------------+------------+-------------+---------------------------------+---------+------
>             ks |       test |          c1 | 2017-07-25 17:53:47.651000+0000 | regular
|  int
> (1 rows)
> {noformat}
> This can have surprising consequences when creating another table with the same name.



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