[jira] [Closed] (IGNITE-2751) GridH2TreeIndex.getRowCount unwraps objects' values that are not used later

["Denis Magda (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Denis Magda closed IGNITE-2751.
-------------------------------

> GridH2TreeIndex.getRowCount unwraps objects' values that are not used later
> ---------------------------------------------------------------------------
>
>                 Key: IGNITE-2751
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2751
>             Project: Ignite
>          Issue Type: Bug
>    Affects Versions: 1.5.0.final
>            Reporter: Denis Magda
>            Assignee: Alexei Scherbakov
>            Priority: Critical
>              Labels: community, important
>             Fix For: 1.6
>
>         Attachments: Benchmark.java
>
>
> If to run query like "SELECT COUNT(*) FROM table" then our implementation will perform a full scan filtering out entries that are not primary for a given node and will calculate only a number of primary ones.
> If entries are stored off-heap then both a key and value of an entry are unswapped, Unswapped values are not used by backup filters thus we have to omit unswapping of the values at all.



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