jamesstarr opened a new pull request #2538:
URL: https://github.com/apache/calcite/pull/2538
Moving janino metadata dispatch from scan of an array containing all
known rel subtypes to a chain of if instanceof RelNode subclass. Thus,
removing requirement of registering relnode subtypes to prevent
metadata handler regeneration.
* Adding DelegatingMetadataRel to remove the cyclic dependency between
metadata and planners. These intermediate nodes will not be cached.
Adding the this interface to HepRelVertex.
* Removing unused rel metadata methods for HepRelVertex.
* Removing from JaninoRelMetadataProvider: registerMetadataRels,
register, ALL_RELS. These kept a list of all know subclass of
RelNode which no longer need.
* Adding JaninoRelMetadataProvider.generateCachedMethod for clarity
* Moving rel metadata dispatch generation logic from
JaninoRelMetadataProvider to DispatchGenerator.
* Adding CodeGeneratorUtil for shared methods across DispatchGenerator
and JaninoRelMetadataProvider.
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