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https://issues.apache.org/jira/browse/CASSANDRA-12060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15493095#comment-15493095
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Sylvain Lebresne commented on CASSANDRA-12060:
----------------------------------------------
I really don't think we should modify anything in 2.1 and 2.2 here. And 3.x
should behave as 2.x as much as possible, unless there is a good reason to
think the 2.x behavior is broken and even then we should probably only consider
fixing it in 3.x at this point.
> Establish consistent distinction between non-existing partition and NULL
> value for LWTs on static columns
> ---------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-12060
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12060
> Project: Cassandra
> Issue Type: Bug
> Reporter: Alex Petrov
> Assignee: Alex Petrov
>
> When executing following CQL commands:
> {code}
> CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy',
> 'datacenter1': '1' };
> USE test;
> CREATE TABLE testtable (a int, b int, s1 int static, s2 int static, v int,
> PRIMARY KEY (a, b));
> INSERT INTO testtable (a,b,s1,s2,v) VALUES (2,2,2,null,2);
> DELETE s1 FROM testtable WHERE a = 2 IF s2 IN (10,20,30);
> {code}
> The output is different between {{2.x}} and {{3.x}}:
> 2.x:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 2 IF s2 = 5;
> [applied] | s2
> -----------+------
> False | null
> {code}
> 3.x:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 2 IF s2 = 5;
> [applied]
> -----------
> False
> {code}
> {{2.x}} would although return same result if executed on a partition that
> does not exist at all:
> {code}
> cqlsh:test> DELETE s1 FROM testtable WHERE a = 5 IF s2 = 5;
> [applied]
> -----------
> False
> {code}
> It _might_ be related to static column LWTs, as I could not reproduce same
> behaviour with non-static column LWTs. The most recent change was
> [CASSANDRA-10532], which enabled LWT operations on static columns with
> partition keys only. -Another possible relation is [CASSANDRA-9842], which
> removed distinction between {{null}} column and non-existing row.- (striked
> through since same happens on pre-[CASSANDRA-9842] code.
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