Julian Hyde created CALCITE-1530:
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Summary: 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
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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