henvealf created FLINK-18599:
--------------------------------
Summary: Compile error when use windowAll and TumblingProcessingTimeWindows
Key: FLINK-18599
URL:
https://issues.apache.org/jira/browse/FLINK-18599 Project: Flink
Issue Type: Bug
Components: API / DataStream
Affects Versions: 1.11.0
Reporter: henvealf
Code:
{code:java}
import org.apache.commons.lang3.StringUtils
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.streaming.api.windowing.assigners.{TumblingProcessingTimeWindows}
import org.apache.flink.streaming.api.windowing.time.Time
import org.apache.flink.streaming.api.scala._
val env = StreamExecutionEnvironment.getExecutionEnvironment
val stream = env.fromElements("a", "b", "c")
stream
.filter((str: String) => StringUtils.isNotEmpty(str))
.map( _ => 1)
.windowAll(TumblingProcessingTimeWindows.of(Time.seconds(5)))
.reduce((a1, a2) => a1 + a2)
.print()
{code}
Compile failed:
{code:java}
error: type mismatch;
found : org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows
required: org.apache.flink.streaming.api.windowing.assigners.WindowAssigner[_ >: Int, ?]
Note: Object <: Any (and org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows <: org.apache.flink.streaming.api.windowing.assigners.WindowAssigner[Object,org.apache.flink.streaming.api.windowing.windows.TimeWindow]), but Java-defined class WindowAssigner is invariant in type T.
You may wish to investigate a wildcard type such as `_ <: Any`. (SLS 3.2.10)
.windowAll(TumblingProcessingTimeWindows.of(Time.seconds(5)))
^
one error found
{code}
What went wrong?
Thanks.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)