[jira] [Comment Edited] (CASSANDRA-8767) "Added column does not sort as the last column" when using new python driver

["Tyler Hobbs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324681#comment-14324681 ] 

Tyler Hobbs edited comment on CASSANDRA-8767 at 2/17/15 7:03 PM:
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It looks like the root of the problem is that ColumnFamily serialization doesn't include a {{reversed}} flag.  When the query is executed locally, the {{reversed}} flag is set on the CF holding the results.  When it's executed remotely and then deserialized, it's not.  The {{reversed}} flag is then used to alter the comparator for adding cells to the CF.  This causes the comparator to be incorrect for the remote-execution case, leading to the assertion error.


was (Author: thobbs):
It looks like the root of the problem is that ColumnFamily serialization doesn't include a {{reversed}} flag.  When the query is executed locally, the {{reversed}} flag is set on the CF holding the results.  When it's executed remotely and then deserialized, it's not.  The {{reversed}} flag is then used to alter the comparator for adding cells to the CF.  This causes the comparator incorrect for the remote-execution case, leading to the assertion error.

> "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, 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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