Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3547#discussion_r106335062
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/rel/LogicalWindowAggregate.scala
---
@@ -18,8 +18,6 @@
package org.apache.flink.table.plan.logical.rel
-import java.util
--- End diff --
Your current package is `org.apache.flink.table.plan.logical.rel`, in this
package there is a` org.apache.flink.table.plan.logical.rel.util`, this and
`util .List` package conflicts. So you can try the following 2 way solution:
solution1:
```
import java.util.List
groupSets: List[ImmutableBitSet],
aggCalls: List[AggregateCall])
```
solution2:
```
import java.{util => JUtil}
groupSets: JUtil.List[ImmutableBitSet],
aggCalls: JUtil.List[AggregateCall])
```
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