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Posted to issues@calcite.apache.org by "Vladimir Sitnikov (Jira)" <ji...@apache.org> on 2020/01/01 20:23:00 UTC

[jira] [Assigned] (CALCITE-3661) Derive rowCount statistics for tables in ReflectiveSchema that are based on arrays/collections

     [ https://issues.apache.org/jira/browse/CALCITE-3661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Sitnikov reassigned CALCITE-3661:
------------------------------------------

    Assignee: Vladimir Sitnikov

> Derive rowCount statistics for tables in ReflectiveSchema that are based on arrays/collections
> ----------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-3661
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3661
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.21.0
>            Reporter: Vladimir Sitnikov
>            Assignee: Vladimir Sitnikov
>            Priority: Major
>
> ReflectiveSchema is used quite common in Calcite tests, however, it misses statistics, so every reflective table is assumed to have 100 rows which makes it hard to understand if the optimizer is making reasonable decisions (e.g. join ordering).



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