[jira] [Commented] (CASSANDRA-11805) Row deleted when value updated to null

["Philip Thompson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-11805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285777#comment-15285777 ] 

Philip Thompson commented on CASSANDRA-11805:
---------------------------------------------

This is expected behavior. I'll jira dive for the last time it was filed, for the response I was given.

> Row deleted when value updated to null
> --------------------------------------
>
>                 Key: CASSANDRA-11805
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11805
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: C* 3.5, both single node and cluster, C* 3.6 snapshot single node
>            Reporter: Jaroslav Kamenik
>
> It seems that the behaviour of the value update to null differs when row is created by insert or update. When it is inserted the row stays and the value is null, when updated the row is deleted.
> Simple example:
> Inserts:
> create table aaa (a ascii, b ascii, c ascii, primary key (a,b));
> insert into aaa (a,b,c) values ('a','b','c');
> insert into aaa (a,b,c) values ('a','c','d');
> insert into aaa (a,b,c) values ('a','d','e');
> select * from aaa;
>  a | b | c
> ---+---+---
>  a | b | c
>  a | c | d
>  a | d | e
> update aaa set c = null where a='a' and b='b';
> select * from aaa;
>  a | b | c
> ---+---+------
>  a | b | null
>  a | c |    d
>  a | d |    e
> Updates:
> create table bbb (a ascii, b ascii, c ascii, primary key (a,b));
> update bbb set c = 'c' where a='a' and b='b';
> update bbb set c = 'd' where a='a' and b='c';
> update bbb set c = 'e' where a='a' and b='d';
> select * from bbb;
>  a | b | c
> ---+---+---
>  a | b | c
>  a | c | d
>  a | d | e
> update bbb set c = null where a='a' and b='b';
> select * from bbb;
>  a | b | c
> ---+---+---
>  a | c | d
>  a | d | e



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