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Posted to issues@calcite.apache.org by "Teruyoshi Zenmyo (JIRA)" <ji...@apache.org> on 2018/06/15 05:20:00 UTC
[jira] [Created] (CALCITE-2363) Refactor RelShuttle not to depend
on structures of RelNodes
Teruyoshi Zenmyo created CALCITE-2363:
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Summary: Refactor RelShuttle not to depend on structures of RelNodes
Key: CALCITE-2363
URL: https://issues.apache.org/jira/browse/CALCITE-2363
Project: Calcite
Issue Type: Improvement
Reporter: Teruyoshi Zenmyo
Assignee: Julian Hyde
Currently, RelShuttle implementations depends on the structures of RelNodes.
For instance, RelShuttleImp.visit(LogicalAggregate aggregate) knows the first element of getInput() is the next element to be visited.
[https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/RelShuttleImpl.java#L75]
By this refactoring, implementations of RelShuttle will become free from invoking super.visit methods.
https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/CorrelationReferenceFinder.java#L61
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