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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2018/03/16 14:30:00 UTC

[jira] [Updated] (IGNITE-3171) Support column selectivity calculation for SQL

     [ https://issues.apache.org/jira/browse/IGNITE-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-3171:
------------------------------------
    Labels: sql-performance  (was: )

> Support column selectivity calculation for SQL
> ----------------------------------------------
>
>                 Key: IGNITE-3171
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3171
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>            Reporter: Sergi Vladykin
>            Priority: Major
>              Labels: sql-performance
>
> Need to support ANALYZE command. http://h2database.com/html/grammar.html#analyze
> Currently H2 explicitly ignores external table engines (don't see any reasons why). Probably we have to fix H2 by adding method Table.canAnalyze() and use it in that check.
> Also when IGNITE-1232 will be merged we'll need to propagate this statistics to clients.



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