[jira] [Created] (CASSANDRA-13130) Strange result of several list updates in a single request

["Mikhail Krupitskiy (JIRA)" <ji...@apache.org>]

Mikhail Krupitskiy created CASSANDRA-13130:
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             Summary: Strange result of several list updates in a single request
                 Key: CASSANDRA-13130
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13130
             Project: Cassandra
          Issue Type: Bug
            Reporter: Mikhail Krupitskiy
            Priority: Critical


Let's assume that we have a row with the 'listColumn' column and value \{1,2,3,4\}.
For me it looks logical to expect that the following two pieces of code will ends up with the same result but it isn't so.
Code1:
{code}
UPDATE t SET listColumn[2] = 7, listColumn[2] = 8  WHERE id = 1;
{code}
Expected result: listColumn=\{1,2,8,4\} 
Actual result: listColumn=\{1,2,7,8,4\}

Code2:
{code}
UPDATE t SET listColumn[2] = 7  WHERE id = 1;
UPDATE t SET listColumn[2] = 8  WHERE id = 1;
{code}
Expected result: listColumn=\{1,2,8,4\} 
Actual result: listColumn=\{1,2,8,4\}

So the question is why Code1 and Code2 give different results?
Looks like Code1 should give the same result as Code2.



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