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https://issues.apache.org/jira/browse/CASSANDRA-7304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oded Peer updated CASSANDRA-7304:
---------------------------------
Attachment: 7304-03.patch
7304-03.patch contents:
* Updated the v4 spec doc
* Handled backward compatilbilty in {{CBUtil.readValue}} by inspecting the
version protocol
* Reverted modifications to CQLTester
* Handled collections and counters
* Since a UDT value is always written in its entirety Cassandra can't preserve
a pre-existing value by 'not setting' the new value. unset values in UDT are
treated as null values.
* Added tests for collections and counters and UDT
> Ability to distinguish between NULL and UNSET values in Prepared Statements
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-7304
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7304
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Drew Kutcharian
> Labels: cql, protocolv4
> Fix For: 3.0
>
> Attachments: 7304-03.patch, 7304-2.patch, 7304.patch
>
>
> Currently Cassandra inserts tombstones when a value of a column is bound to
> NULL in a prepared statement. At higher insert rates managing all these
> tombstones becomes an unnecessary overhead. This limits the usefulness of the
> prepared statements since developers have to either create multiple prepared
> statements (each with a different combination of column names, which at times
> is just unfeasible because of the sheer number of possible combinations) or
> fall back to using regular (non-prepared) statements.
> This JIRA is here to explore the possibility of either:
> A. Have a flag on prepared statements that once set, tells Cassandra to
> ignore null columns
> or
> B. Have an "UNSET" value which makes Cassandra skip the null columns and not
> tombstone them
> Basically, in the context of a prepared statement, a null value means delete,
> but we don’t have anything that means "ignore" (besides creating a new
> prepared statement without the ignored column).
> Please refer to the original conversation on DataStax Java Driver mailing
> list for more background:
> https://groups.google.com/a/lists.datastax.com/d/topic/java-driver-user/cHE3OOSIXBU/discussion
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