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https://issues.apache.org/jira/browse/CASSANDRA-17762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17569171#comment-17569171
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Benedict Elliott Smith commented on CASSANDRA-17762:
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bq. This doesn't seem ML-worthy
I think stuff that changes the semantics of CQL do need to be run past the
mailing list, even if it's just to make sure there's visibility for others to
express their opinions.
> LWT IF col = NULL is inconsistent with SQL NULL
> -----------------------------------------------
>
> Key: CASSANDRA-17762
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17762
> Project: Cassandra
> Issue Type: Bug
> Components: CQL/Semantics
> Reporter: Avi Kivity
> Priority: Normal
> Fix For: 4.x
>
>
> In SQL, any comparison with NULL is NULL, which is interpreted as FALSE in a
> condition. To test for NULLness, you use IS NULL or IS NOT NULL.
> But LWT uses IF col = NULL as a NULLness test. This is likely to confuse
> people coming from SQL and hamper attempts to extend the dialect.
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