nielspardon opened a new pull request, #4841:
URL: https://github.com/apache/calcite/pull/4841

   ## Jira Link
   
   [CALCITE-7447](https://issues.apache.org/jira/browse/CALCITE-7447)
   
   ## Changes Proposed
   
   While Calcite does not officially have DDL RelNodes we are [extending 
Calcite in 
substrait-java](https://github.com/substrait-io/substrait-java/tree/main/isthmus/src/main/java/io/substrait/isthmus/calcite/rel)
 to be able to work with DDL operations as RelNodes.
   
   When we then use the `RelRoot.project(true)` function to access the 
`RelRoot.rel` these DDL operations are currently getting wrapped in a 
`LogicalProject` which obviously does not make sense.
   
   Since the code in `RelRoot.project()` already checks whether the 
`RelRoot.kind` is a DML operation we can simply also check whether it is a DDL 
operation to avoid falsely wrapping those operations in a `LogicalProject`.


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