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From "Alex Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-11339) WHERE clause in SELECT DISTINCT can be ignored
Date Tue, 05 Apr 2016 12:40:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226056#comment-15226056
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Alex Petrov edited comment on CASSANDRA-11339 at 4/5/16 12:40 PM:
------------------------------------------------------------------

I've added validation that would disallow any filtering queries. Non-filtering queries (partition
key locked ones, which is a bit senseless, even though technically valid). Index queries also
work. The tests for all cases, including static columns and indexes are added.

|[trunk|https://github.com/ifesdjeen/cassandra/tree/11339-trunk]|[2.1|https://github.com/ifesdjeen/cassandra/tree/11339-2.1]|


was (Author: ifesdjeen):
I've added validation that would disallow any filtering queries. Non-filtering queries (partition
key locked ones, which is a bit senseless, even though technically valid). Index queries also
work. The tests for all cases, including static columns and indexes are added.

|[trunk|https://github.com/ifesdjeen/cassandra/tree/11339-trunk]|

> WHERE clause in SELECT DISTINCT can be ignored
> ----------------------------------------------
>
>                 Key: CASSANDRA-11339
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11339
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>            Reporter: Philip Thompson
>            Assignee: Alex Petrov
>             Fix For: 2.1.x
>
>         Attachments: 0001-Add-validation-for-distinct-queries-disallowing-quer.patch
>
>
> I've tested this out on 2.1-head. I'm not sure if it's the same behavior on newer versions.
> For a given table t, with {{PRIMARY KEY (id, v)}} the following two queries return the
same result:
> {{SELECT DISTINCT id FROM t WHERE v > X ALLOW FILTERING}}
> {{SELECT DISTINCT id FROM t}}
> The WHERE clause in the former is silently ignored, and all id are returned, regardless
of the value of v in any row. 
> It seems like this has been a known issue for a while:
> http://stackoverflow.com/questions/26548788/select-distinct-cql-ignores-where-clause
> However, if we don't support filtering on anything but the partition key, we should reject
the query, rather than silently dropping the where clause



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