[jira] [Updated] (CASSANDRA-16223) Reading dense table yields invalid results in case of row scan queries

["Sylvain Lebresne (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne updated CASSANDRA-16223:
-----------------------------------------
    Status: Ready to Commit  (was: Review In Progress)

> Reading dense table yields invalid results in case of row scan queries
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-16223
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16223
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Consistency/Coordination
>            Reporter: Jacek Lewandowski
>            Assignee: Jacek Lewandowski
>            Priority: Normal
>             Fix For: 3.11.x
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> {{ThriftIntegrationTest}} is broken in the way that it does not actually test reads before and after flushing, because it does not do flush at all (see https://github.com/apache/cassandra/blob/cassandra-3.11/test/unit/org/apache/cassandra/cql3/validation/ThriftIntegrationTest.java#L939). After fixing that method so that it really flushes memtables to disk, we can see inconsistency in reads from dense table - the results returned from memtable differs from the results returned from sstable (the later are wrong, cell values are skipped unexpectedly).
> {noformat}
> java.lang.AssertionError: Invalid value for row 0 column 0 (value of type ascii), expected <value1> but got <>
> {noformat}
> In principle this problems is about skipping column values when doing row scan queries with explicitly selected columns (not wildcard), when the columns belong to a super column. This happens only when reading from sstables, it does not happen when reading from memtables.



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