Caican Cai created CALCITE-6701:
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             Summary: Refactor the data type in the filter structure in the 
Arrow adapter
                 Key: CALCITE-6701
                 URL: https://issues.apache.org/jira/browse/CALCITE-6701
             Project: Calcite
          Issue Type: Improvement
          Components: arrow-adapter
    Affects Versions: 1.38.0
            Reporter: Caican Cai
             Fix For: 1.39.0


The data type of the filter structure in the current arrow is represented by a 
string. Perhaps we can try to use the structure that comes with Calcite to 
represent these data types, such as RelDataType



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