vvysotskyi commented on pull request #2275:
URL: https://github.com/apache/drill/pull/2275#issuecomment-881235096


   @paul-rogers, thanks for the review!
   These plugins should be of different types to reproduce the issue, for 
example, JDBC and Elasticsearch, or JDBC and Cassandra, so it is a problem for 
adding end-to-end test since we don't have a module with several plugin 
dependencies.
   
   Regarding updated rules, the main change is in its constructor, now it has 
the `RelOptRuleOperand` that controls conventions of the rel nodes, but it is 
slightly problematic to create all required instances for checking whether the 
rule would or wouldn't match the specific rel node.


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