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Posted to issues@calcite.apache.org by "Rui Wang (Jira)" <ji...@apache.org> on 2020/09/03 17:29:00 UTC

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

    [ https://issues.apache.org/jira/browse/CALCITE-4223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17190324#comment-17190324 ] 

Rui Wang edited comment on CALCITE-4223 at 9/3/20, 5:28 PM:
------------------------------------------------------------

[~Chunwei Lei]

Out of curiosity: could you share some relevant links/information about Column stats? Is such stats are used for column-oriented storage?


was (Author: amaliujia):
[~Chunwei Lei]

Out of curiosity: could you share some relevant links/information about NDV/Column stats? Is such stats are used for column-oriented storage?

> 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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