[jira] [Created] (CALCITE-7354) Add assertion that the size of the Project's variablesSet should be less than or equal to 1

[xiong duan (Jira)]

xiong duan created CALCITE-7354:
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             Summary: Add assertion that the size of the Project's variablesSet 
should be less than or equal to 1
                 Key: CALCITE-7354
                 URL: https://issues.apache.org/jira/browse/CALCITE-7354
             Project: Calcite
          Issue Type: Bug
         Environment: This issue originates from a comment on 
[https://github.com/apache/calcite/pull/4714.]

In RelFieldTrimmer, we assume that a Project has only one external reference. 
In CALCITE-7348, we will remove the corresponding detection due to duplicate 
functionality.
            Reporter: xiong duan






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