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Posted to issues@calcite.apache.org by "Chunwei Lei (Jira)" <ji...@apache.org> on 2020/09/03 07:39:00 UTC

[jira] [Assigned] (CALCITE-4223) Introducing column statistics to RelOptTable

     [ https://issues.apache.org/jira/browse/CALCITE-4223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chunwei Lei reassigned CALCITE-4223:
------------------------------------

    Assignee: Chunwei Lei

> Introducing column statistics to RelOptTable
> --------------------------------------------
>
>                 Key: CALCITE-4223
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4223
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Chunwei Lei
>            Assignee: Chunwei Lei
>            Priority: Major
>
> Many systems depend on column statistics to compute more accurate stats, such as NDV, average column size, and so on. It would be nice if Calcite can provide such an interface.
> Column statistics might include NDV, average/max column length, number of nulls, number of trues, number of falses and so on. 
> What do you think?
>  



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