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https://issues.apache.org/jira/browse/CALCITE-603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-603:
--------------------------------
Description:
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}
was:
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.
I think this should be a single interface with two methods: {code}interface
Volume {
List<Double> averageColumnSize();
Double averageRowSize();
}{code}
> 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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