[PR] [CALCITE-7354] Add assertion that the size of the Project's variablesSet should be less than or equal to 1 [calcite]

[via GitHub]

AestheticAkhmad opened a new pull request, #4865:
URL: https://github.com/apache/calcite/pull/4865

   ## Jira Link
   
   [CALCITE-7354](https://issues.apache.org/jira/browse/CALCITE-7354)
   
   ## Changes Proposed
   
   Added `checkArgument()` assertion to ensure 
`project.getVariablesSet().size()` contains at most one correlation variable in 
RelFieldTrimmer.
   


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