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[jira] [Created] (CALCITE-2694) Improve type conversion with respect to charset and collation


Ted Xu created CALCITE-2694:
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             Summary: Improve type conversion with respect to charset and collation
                 Key: CALCITE-2694
                 URL: https://issues.apache.org/jira/browse/CALCITE-2694
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Ted Xu
            Assignee: Julian Hyde


Type conversion need to improved both in correctness and efficiency w.r.t. charset and collation. The changes include:
 # RexSimplify
 # RexDataTypeFactory#leastRestrictive



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