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https://issues.apache.org/jira/browse/CALCITE-1530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1530.
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Resolution: Fixed
Fix Version/s: 1.11.0
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/267e2f3e.
> Create a Shuttle for visiting linq4j expressions without mutating them
> ----------------------------------------------------------------------
>
> Key: CALCITE-1530
> URL: https://issues.apache.org/jira/browse/CALCITE-1530
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Fix For: 1.11.0
>
>
> Create a shuttle for visiting linq4j expressions without mutating them.
> Rename the current {{Visitor}} class to {{Shuttle}}, create a new
> {{Visitor<R>}} interface, and a default implementation {{VisitorImpl<R>}},
> and add a method {{<R> R Node.accept(Visitor<R> visitor)}}.
> Note that {{accept}}'s return type is {{R}}: not necessarily a node, in fact
> often {{Void}}.
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