[jira] [Commented] (CALCITE-603) Metadata provider for average row size and column size

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334220#comment-14334220 ] 

Julian Hyde commented on CALCITE-603:
-------------------------------------

Please review https://github.com/julianhyde/incubator-calcite/tree/calcite-603.

> Metadata provider for average row size and column size
> ------------------------------------------------------
>
>                 Key: CALCITE-603
>                 URL: https://issues.apache.org/jira/browse/CALCITE-603
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>
> Add a metadata provider for average row size and column size (both in bytes).
> This can be used, among other things, to determine the degree of parallelism and whether there is adequate memory to put multiple operators in the same process. (See [email thread|http://mail-archives.apache.org/mod_mbox/incubator-calcite-dev/201502.mbox/%3CCAMCtme%2BST-pxDT3pYyvrV4RmONYQR2_BguZY5TOMMccAH8DeCw%40mail.gmail.com%3E].)
> I think this should be a single interface with two methods: {code}interface Volume {
>   List<Double> averageColumnSize();
>   Double averageRowSize();
> }{code}



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