[jira] [Created] (FLINK-6406) Cleanup useless import

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-6406:
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             Summary: Cleanup useless import
                 Key: FLINK-6406
                 URL: https://issues.apache.org/jira/browse/FLINK-6406
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
    Affects Versions: 1.3.0
            Reporter: sunjincheng
            Assignee: sunjincheng


When browsing the code, it is found that there are some useless reference in the following file which need cleanup.

*packages.scala
*ExternalCatalogTable
*arithmetic.scala
*array.scala
*ColumnStats



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