[jira] [Created] (FLINK-6304) Clear a lot of useless import

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-6304:
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             Summary: Clear a lot of useless import
                 Key: FLINK-6304
                 URL: https://issues.apache.org/jira/browse/FLINK-6304
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: sunjincheng
            Assignee: sunjincheng


There are some classes(as follow) have useless import, I want clear them before release 1.3.
{code}
DataSetSlideTimeWindowAggFlatMapFunction
CommonScan
FlinkRel
StreamTableSourceScanRule
DataStreamOverAggregateRule
DataStreamAggregateRule
{code}



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