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Posted to commits@cassandra.apache.org by "Frank Limstrand (JIRA)" <ji...@apache.org> on 2014/12/16 10:14:13 UTC
[jira] [Created] (CASSANDRA-8490) Tombstone stops paging through
resultset when distinct keyword is used.
Frank Limstrand created CASSANDRA-8490:
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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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