hsyuan opened a new pull request #1912: [CALCITE-3889] Add 
apply(Mappings.Mapping) to RelTrait and RelTraitSet
URL: https://github.com/apache/calcite/pull/1912
 
 
   RelTrait Collation, Distribution have key indices, when we pass down the
   traitset to child or propagate to parent operator, we have to remap these 
keys.
   It would be nice to have apply(Mappings.Mapping) on RelTrait and RelTraitSet.
   RelDistribution already has the method, but we may want it on every RelTrait
   except Convention. (CALCITE-3889)

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