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Tyler Hobbs updated CASSANDRA-8490: ----------------------------------- Summary: DISTINCT queries with LIMITs or paging are incorrect when partitions are deleted (was: Tombstone stops paging through resultset when distinct keyword is used.) > 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 > > > 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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)