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[jira] [Created] (CALCITE-2677) Struct types with one field are not mapped correctly to Java Classes


Stamatis Zampetakis created CALCITE-2677:
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             Summary: Struct types with one field are not mapped correctly to Java Classes
                 Key: CALCITE-2677
                 URL: https://issues.apache.org/jira/browse/CALCITE-2677
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.17.0
            Reporter: Stamatis Zampetakis
            Assignee: Julian Hyde
             Fix For: 1.18.0


There are various places in the code where given a RelDataType we need to obtain the respective Java Class/Type. This is done mainly through JavaTypeFactory#getJavaClass. For the Calcite runtime it passes through PhysType#fieldClass and PhysType#getJavaFieldType. 

However, when the RelDataType is a struct of one field the returned Class/Type is not the correct one since the struct type is simplified to the type of its component. 



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