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