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https://issues.apache.org/jira/browse/CASSANDRA-11911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15314262#comment-15314262
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Sylvain Lebresne commented on CASSANDRA-11911:
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bq. 3. Invent a new constant that represents an UNSET value which can be used
in place of NULL.
We actually have said constant internally, in {{ByteBufferUtil}}, so we
probably just should expose it in {{CQLSSTableWriter}}. So it's pretty trivial.
> CQLSSTableWriter should allow for unset fields
> ----------------------------------------------
>
> Key: CASSANDRA-11911
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11911
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Environment: Cassandra 3.0.6
> Reporter: Matt Kopit
> Labels: lhf
>
> If you are using CQLSSTableWriter to bulk load data into sstables the only
> way to handle fields without values is by setting them to NULL, which results
> in the generation of a tombstoned field in the resulting sstable. For a large
> dataset this can result in a large number of tombstones.
> CQLSSTableWriter is currently instantiated with a single INSERT statement, so
> it's not an option to modify the insert statement to specify different fields
> on a per-row basis.
> Here are three potential solutions to this problem:
> 1. Change the default behavior of how NULLs are handled so those fields are
> treated as UNSET and will never be written to the sstable.
> 2. Create a configuration option for CQLSSTableWriter that governs whether
> NULLs should be ignored.
> 3. Invent a new constant that represents an UNSET value which can be used in
> place of NULL.
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