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

["Jaroslav Kamenik (JIRA)" <ji...@apache.org>]

Jaroslav Kamenik created CASSANDRA-11805:
--------------------------------------------

             Summary: 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
            Reporter: Jaroslav Kamenik
            Priority: Critical


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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