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From "Olivier Michallat (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9198) Deleting from an empty list produces an error
Date Wed, 15 Apr 2015 21:28:58 GMT
Olivier Michallat created CASSANDRA-9198:
--------------------------------------------

             Summary: Deleting from an empty list produces an error
                 Key: CASSANDRA-9198
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9198
             Project: Cassandra
          Issue Type: Bug
          Components: API
            Reporter: Olivier Michallat
            Priority: Minor


While deleting an element from a list that does not contain it is a no-op, deleting it from
an empty list causes an error.
This edge case is a bit inconsistent, because it makes list deletion non idempotent:
{code}
cqlsh:test> create table foo (k int primary key, v list<int>);
cqlsh:test> insert into foo(k,v) values (1, [1,2]);

cqlsh:test> update foo set v = v - [1] where k = 1;
cqlsh:test> update foo set v = v - [1] where k = 1;

cqlsh:test> update foo set v = v - [2] where k = 1;
cqlsh:test> update foo set v = v - [2] where k = 1;
InvalidRequest: code=2200 [Invalid query] message="Attempted to delete an element from a list
which is null"
{code}
With speculative retries coming to the drivers, idempotency becomes more important because
it determines which query we might retry or not. So it would be better if deleting from an
empty list succeeded.



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