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From "Frank Limstrand (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8490) Tombstone stops paging through resultset when distinct keyword is used.
Date Tue, 16 Dec 2014 09:14:13 GMT
Frank Limstrand created CASSANDRA-8490:
------------------------------------------

             Summary: Tombstone stops paging through resultset when distinct keyword is used.
                 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


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':

cqlsh:datastax_paging_demo> delete from datastax_paging_demo.products  where productId
= 'P142'; (The specified productid is number 6 in the resultset.)

and run the same query ("Select * from") again we get:

[com.datastax.paging.Main.main()] INFO  com.datastax.paging.Main - Paging demo took 0 secs.
Total Products : 999

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:

[com.datastax.paging.Main.main()] INFO  com.datastax.paging.Main - Paging demo took 0 secs.
Total Products : 99

So it looks like the tombstone stops the paging behaviour. Is this a bug?

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


with kind regards
Frank Limstrand



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