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https://issues.apache.org/jira/browse/CASSANDRA-8490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tyler Hobbs updated CASSANDRA-8490:
-----------------------------------
Attachment: 8490-trunk.txt
8490-2.0.txt
Okay, the attached patches take the approach of using -2 for
{{compositesToGroup()}}. I've also pushed a
[dtest|https://github.com/thobbs/cassandra-dtest/tree/CASSANDRA-8490].
> DISTINCT queries with LIMITs or paging are incorrect when partitions are
> deleted
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-8490
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8490
> Project: Cassandra
> Issue Type: Bug
> Environment: Driver version: 2.1.3.
> Cassandra version: 2.0.11/2.1.2.
> Reporter: Frank Limstrand
> Assignee: Tyler Hobbs
> Fix For: 2.0.12, 2.1.3
>
> Attachments: 8490-2.0.txt, 8490-trunk.txt
>
>
> Using paging demo code from
> https://github.com/PatrickCallaghan/datastax-paging-demo
> The code creates and populates a table with 1000 entries and pages through
> them with setFetchSize set to 100. If we then delete one entry with 'cqlsh':
> {noformat}
> cqlsh:datastax_paging_demo> delete from datastax_paging_demo.products where
> productId = 'P142'; (The specified productid is number 6 in the resultset.)
> {noformat}
> and run the same query ("Select * from") again we get:
> {noformat}
> [com.datastax.paging.Main.main()] INFO com.datastax.paging.Main - Paging
> demo took 0 secs. Total Products : 999
> {noformat}
> which is what we would expect.
> If we then change the "select" statement in dao/ProductDao.java (line 70)
> from "Select * from " to "Select DISTINCT productid from " we get this result:
> {noformat}
> [com.datastax.paging.Main.main()] INFO com.datastax.paging.Main - Paging
> demo took 0 secs. Total Products : 99
> {noformat}
> So it looks like the tombstone stops the paging behaviour. Is this a bug?
> {noformat}
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,431 Message.java
> (line 319) Received: QUERY Select DISTINCT productid from
> datastax_paging_demo.products, v=2
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,434
> AbstractQueryPager.java (line 98) Fetched 99 live rows
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,434
> AbstractQueryPager.java (line 115) Got result (99) smaller than page size
> (100), considering pager exhausted
> {noformat}
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