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https://issues.apache.org/jira/browse/CASSANDRA-10438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ariel Weisberg updated CASSANDRA-10438:
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Reviewer: Ariel Weisberg
> Overwrites of rows in memtable produce incorrect deltas for indexing
> --------------------------------------------------------------------
>
> Key: CASSANDRA-10438
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10438
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Fix For: 3.0.0 rc2
>
>
> When a row in the memtable is updated, the delta is supplied to any
> registered indexer. This consists of two {{Row}} objects, representing the
> old and new data in the memtable. As per its javadoc, the contract of
> {{Index.Indexer::updateRow}} is that these old & new rows contain only the
> changed columns, so any column which was not affected by the update will
> appear in neither the new nor old row. The {{RowDiffListener::onCell}} method
> in {{SecondaryIndexManager.WriteTimeTransaction::onUpdated}} which produces
> these deltas uses a reference equality check, where it should be checking
> object equality. This results in unchanged, prexisting cells appearing in the
> {{toInsert}} row.
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