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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5718) Cql3 reader returns duplicate rows if the cluster column is reversed
Date Mon, 29 Jul 2013 21:25:49 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13722996#comment-13722996
] 

Jonathan Ellis commented on CASSANDRA-5718:
-------------------------------------------

Right; I'm saying that the only place this sets reversed away from its default of false is
here:

{code}
+        if (comparatorValidator instanceof CompositeType)
+        {
+            for (int i = 0; i < clusterColumns.size(); i++)
+                clusterColumns.get(i).reversed = (((CompositeType) comparatorValidator).types.get(i)
instanceof ReversedType);
{code}
                
> Cql3 reader returns duplicate rows if the cluster column is reversed
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-5718
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5718
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.6
>            Reporter: Alex Liu
>            Assignee: Alex Liu
>             Fix For: 1.2.9
>
>         Attachments: 5718-1.2-branch.txt
>
>
> To reproduce it,
> cqlsh:test>  select * from wordfreq;
>  title   | occurances | word
> ---------+------------+-------
>  alex123 |          4 |  liu3
>    alex1 |      23456 |  liu2
>   alex10 |         10 | liu10
>   alex12 |         34 |  liu3
>     alex |     123456 |  liu1
>     alex |       1000 |   liu
> CREATE TABLE wordfreq ( title text, word text, occurances int, PRIMARY KEY (title,occurances))
WITH CLUSTERING ORDER by (occurances DESC);
> The hadoop job returns 7 rows instead of 6 rows. 
> I will post a patch soon.

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