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https://issues.apache.org/jira/browse/CASSANDRA-19637?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ekaterina Dimitrova updated CASSANDRA-19637:
--------------------------------------------
Fix Version/s: 4.0.x
4.1.x
5.0.x
5.x
> LWT conditions behavior on collections is inconsistent
> ------------------------------------------------------
>
> Key: CASSANDRA-19637
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19637
> Project: Cassandra
> Issue Type: Bug
> Components: CQL/Semantics
> Reporter: Benjamin Lerer
> Assignee: Benjamin Lerer
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0.x, 5.x
>
>
> LWT conditions behaviour on collections is inconsistent in several ways
> around null values:
> 1)+Conditions comparing a collection column with a {{null}} value to a
> non-null have a different behaviour for frozen and non-frozen collection+.
> {code}UPDATE myTable SET l = ? WHERE k = 0 IF l < [1, 2]{code}
> If {{l}} is null the previous query will return {{[false, null]}} for a
> frozen collection and {{[true]}} for a non-frozen collection.
> 2) +Conditions on non-frozen collection treat empty differently from null+
> Due to the way multi-cell collections are implemented, it is not possible to
> differentiate between {{null}} and empty collections like it is feasible for
> single cell (frozen) collections. Therefore an empty multi-cell collection
> will always be treated as {{null}}.
> Unfortunately, the way LWT conditions handle that is not consistent with that.
> For example for {{colA list<int>}} non null: {code}.. IF colA >= null{code}
> will throw an invalid request error whereas {code}..IF colA >= []{code} will
> returns {{true}}.
> Moreover, if we insert an empty list through:
> {code}INSERT INTO mytable (pk, colA) VALUES (1, []);{code}
> and use {code}DELETE FROM mytable WHERE pk=1 IF colA = []{code} the returned
> results will be {code}{false, null}{code}. Which can be quite confusing.
> The way to fix that behaviour to make it consistent with other operations is
> to consider empty multi-cell collection input as {{null}} and reject the
> {{null}} input for non {{=}} and {{!=}} operators.
>
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