Jaroslav Kamenik created CASSANDRA-11805:
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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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