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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8767) "Added column does not sort as the last column" when using new python driver
Date Wed, 18 Feb 2015 09:48:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14325661#comment-14325661
] 

Sylvain Lebresne commented on CASSANDRA-8767:
---------------------------------------------

While serializing the {{reversed}} flag could maybe make sense (I say maybe because in practice
we are serializing cells in (non-reversed) comparator order, so we'd have to handle deserialization
specially if we were doing that, which may not be an improvement (but I can agree the way
we handle reversed queries is weird)), I don't think it's practical option. But as the CF
on which this happen in the paging code is a shallow clone in the first place, and pager knows
if it's a reversed query or not, I think we can just clone with the proper insertion order
flag. Attaching trivial patch to show what I mean (untested and without tests, we should push
the test you've been using as dtest).


> "Added column does not sort as the last column" when using new python driver
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8767
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8767
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core, Drivers (now out of tree)
>         Environment: Cassandra 2.0.10, python-driver 2.1.3
>            Reporter: Russ Garrett
>            Assignee: Tyler Hobbs
>             Fix For: 2.0.13
>
>         Attachments: 8767-debug-logging.txt, 8767.patch, describe-table.txt, exception-with-logging.txt,
exception.txt
>
>
> We've just upgraded one of our python apps from using the old cql library to the new
python-driver. When running one particular query, it produces the attached assertion error
in Cassandra. The query is: 
> bq. SELECT buffer, id, type, json FROM events WHERE buffer = %(bid)s AND idkey = %(idkey)s
ORDER BY id ASC
> Where buffer and idkey are integer primary keys, and id is the clustering key (ordered
asc).
> This query, with identical parameters, does not cause this error using the old cql python
library, or with the cqlsh client..



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