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https://issues.apache.org/jira/browse/CALCITE-603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335613#comment-14335613
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Julian Hyde commented on CALCITE-603:
-------------------------------------
Adding to the list of providers:
{code}
interface Size extends Metadata {
Double averageRowSize();
List<Double> averageColumnSizes();
}
interface Parallelism extends Metadata {
Boolean isPhaseTransition();
Integer splitCount();
}
interface Memory extends Metadata {
Double memory();
Double cumulativeMemoryWithinPhase();
Double cumulativeMemoryWithinPhaseSplit();
}
{code}
See
[discussion|http://mail-archives.apache.org/mod_mbox/calcite-dev/201502.mbox/%3ccamctme+st-pxdt3pyyvrv4rmonyqr2_bguzy5tommccah8d...@mail.gmail.com%3E].
> Metadata providers for size, memory, parallelism
> ------------------------------------------------
>
> 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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