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[jira] [Created] (FLINK-11013) Fix distinct aggregates for group window in Table API


Dian Fu created FLINK-11013:
-------------------------------

             Summary: Fix distinct aggregates for group window in Table API
                 Key: FLINK-11013
                 URL: https://issues.apache.org/jira/browse/FLINK-11013
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.6.2
            Reporter: Dian Fu
            Assignee: Dian Fu
             Fix For: 1.8.0


Currently distinct aggregates does not work on group window in Table API.
For the following query:
{code:java}
val table = util.addTable[(Int, Long, String)](
  "MyTable",
  'a, 'b, 'c, 'proctime.proctime, 'rowtime.rowtime)

val result = table
  .window(Tumble over 15.minute on 'rowtime as 'w)
  .groupBy('w)
  .select('a.count.distinct, 'a.sum)
{code}
The following exception will be thrown:
{code:java}
org.apache.flink.table.api.ValidationException: It's not allowed to use an aggregate function as input of another aggregate function

at org.apache.flink.table.plan.logical.LogicalNode.failValidation(LogicalNode.scala:156)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$1$$anonfun$apply$3.apply(operators.scala:643)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$1$$anonfun$apply$3.apply(operators.scala:641)
at org.apache.flink.table.plan.TreeNode.preOrderVisit(TreeNode.scala:82)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$1.apply(operators.scala:641)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$1.apply(operators.scala:640)
at scala.collection.immutable.List.foreach(List.scala:392)
at org.apache.flink.table.plan.logical.WindowAggregate.org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2(operators.scala:640)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$4.apply(operators.scala:654)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2$4.apply(operators.scala:654)
at scala.collection.immutable.List.foreach(List.scala:392)
at org.apache.flink.table.plan.logical.WindowAggregate.org$apache$flink$table$plan$logical$WindowAggregate$$validateAggregateExpression$2(operators.scala:654)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$validate$12.apply(operators.scala:628)
at org.apache.flink.table.plan.logical.WindowAggregate$$anonfun$validate$12.apply(operators.scala:628)
at scala.collection.immutable.List.foreach(List.scala:392)
at org.apache.flink.table.plan.logical.WindowAggregate.validate(operators.scala:628)
at org.apache.flink.table.api.WindowGroupedTable.select(table.scala:1206)
at org.apache.flink.table.api.stream.table.DistinctAggregateTest.testDistinctAggregateOnTumbleWindow(DistinctAggregateTest.scala:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
{code}



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