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https://issues.apache.org/jira/browse/CASSANDRA-13086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15811333#comment-15811333
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Alex Petrov commented on CASSANDRA-13086:
-----------------------------------------
bq. Wouldn't it be better if Cassandra would return a null value instead of not
including the column?
We still need to make a distinction between: non existing partition / existing
partition, existing partition / null value, existing partition / no row. You
can follow the tests I referred to for more information on when the certain
output is returned.
> CAS resultset sometimes does not contain value column even though wasApplied
> is false
> -------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13086
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13086
> Project: Cassandra
> Issue Type: Bug
> Reporter: Christian Spriegel
> Priority: Minor
>
> Every now and then I see a ResultSet for one of my CAS queries that contain
> wasApplied=false, but does not contain my value column.
> I just now found another occurrence, which causes the following exception in
> the driver:
> {code}
> ...
> Caused by: com.mycompany.MyDataaccessException: checkLock(ResultSet[
> exhausted: true, Columns[[applied](boolean)]])
> at com.mycompany.MyDAO._checkLock(MyDAO.java:408)
> at com.mycompany.MyDAO._releaseLock(MyDAO.java:314)
> ... 16 more
> Caused by: java.lang.IllegalArgumentException: value is not a column defined
> in this metadata
> at
> com.datastax.driver.core.ColumnDefinitions.getAllIdx(ColumnDefinitions.java:266)
> at
> com.datastax.driver.core.ColumnDefinitions.getFirstIdx(ColumnDefinitions.java:272)
> at
> com.datastax.driver.core.ArrayBackedRow.getIndexOf(ArrayBackedRow.java:81)
> at
> com.datastax.driver.core.AbstractGettableData.getBytes(AbstractGettableData.java:151)
> at com.mycompany.MyDAO._checkLock(MyDAO.java:383)
> ... 17 more
> {code}
> The query the application was doing:
> delete from "Lock" where lockname=:lockname and id=:id if value=:value;
> I did some debugging recently and was able to track these ResultSets to
> StorageProxy.cas() to the "CAS precondition does not match current values {}"
> return statement.
> I saw this happening with Cassandra 3.0.10 and earlier versions.
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