[jira] [Commented] (CASSANDRA-17913) Nested selection of reversed collections fails

["Maciej Sokol (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-17913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629721#comment-17629721 ] 

Maciej Sokol commented on CASSANDRA-17913:
------------------------------------------

[PR for 4.0|https://github.com/apache/cassandra/pull/1978]

I'm kinda new to this part of the code, i've added unittests for these changes to test different scenarios.

All tests in CollectionsTest are running green for me. If someone can run CI that would be great :)

> Nested selection of reversed collections fails
> ----------------------------------------------
>
>                 Key: CASSANDRA-17913
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17913
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Consistency/Coordination, CQL/Semantics, Legacy/Local Write-Read Paths
>            Reporter: David Capwell
>            Assignee: Maciej Sokol
>            Priority: Normal
>             Fix For: 4.0.x, 4.1.x
>
>
> The following test fails caused by the fact we make reversed a type that wraps the underline type
> {code:java}
> @Test
>     public void testMapsReversed() throws Throwable
>     {
>         createTable("CREATE TABLE %s (" +
>                     "   k int, " +
>                     "   c frozen<map<text, int>>, " +
>                     "   v int, " +
>                     "   PRIMARY KEY(k, c)" +
>                     ") WITH CLUSTERING ORDER BY (c DESC)");
>         execute("SELECT c['testing'] FROM %s");
>     }
> {code}
> With the error
> {code:java}
> org.apache.cassandra.exceptions.InvalidRequestException: Invalid element selection: c is of type frozen<map<text, int>> is not a collection
> {code}
> When you look in a debugger you see that the real type is ReversedType(MapType(…)), so the current checks fail.
> {+}Additional information for newcomers{+}:
>  * The problem impact element selection as well as range selection that where introduced in CASSANDRA-7396 as part of 4.0. So the patch will need to be done for 4.0.
>  * The checks that needs to be modified is in {{Selectable.WithElementSelection}} and {{Selectable.WithSliceSelection}}
>  * The unit tests should be added to {{CollectionsTest}}



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