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https://issues.apache.org/jira/browse/CALCITE-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250297#comment-16250297
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Julian Hyde commented on CALCITE-1048:
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Basically, yes.
I was thinking of doing the same thing in a more abstract way, namely providing
a "[fold|https://en.wikipedia.org/wiki/Fold_(higher-order_function)]" function.
> Make metadata more robust
> -------------------------
>
> Key: CALCITE-1048
> URL: https://issues.apache.org/jira/browse/CALCITE-1048
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Following CALCITE-794, make metadata more robust and performant, so we can
> safely derive metadata from a large RelNode graph.
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