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https://issues.apache.org/jira/browse/FLINK-6091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972717#comment-15972717
]
ASF GitHub Bot commented on FLINK-6091:
---------------------------------------
Github user lincoln-lil commented on a diff in the pull request:
https://github.com/apache/flink/pull/3733#discussion_r111959829
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/stream/RetractionITCase.scala
---
@@ -0,0 +1,310 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.table.api.scala.stream
+
+import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
+import org.apache.flink.table.api.{TableEnvironment, TableException}
+import org.apache.flink.table.api.scala.stream.utils.{StreamITCase,
StreamingWithStateTestBase}
+import org.apache.flink.types.Row
+import org.junit.Assert._
+import org.junit.Test
+import org.apache.flink.table.api.scala._
+import org.apache.flink.api.scala._
+import org.apache.flink.streaming.api.TimeCharacteristic
+import org.apache.flink.table.utils.TableFunc0
+
+import scala.collection.mutable
+
+/**
+ * tests for retraction
+ */
+class RetractionITCase extends StreamingWithStateTestBase {
+ // input data
+ val data = List(
+ ("Hello", 1),
+ ("word", 1),
+ ("Hello", 1),
+ ("bark", 1)
+ )
+
+ // keyed groupby + keyed groupby
+ @Test
+ def testWordCount(): Unit = {
+ val env = StreamExecutionEnvironment.getExecutionEnvironment
+ val tEnv = TableEnvironment.getTableEnvironment(env)
+ StreamITCase.testResults = mutable.MutableList()
+ env.setParallelism(1)
+ env.setStateBackend(getStateBackend)
+
+ val stream = env.fromCollection(data)
+ val table = stream.toTable(tEnv, 'word, 'num)
+ val resultTable = table
+ .groupBy('word)
+ .select('word as 'word, 'num.sum as 'count)
+ .groupBy('count)
+ .select('count, 'word.count as 'frequency)
+
+ val results = resultTable.toDataStream[Row]
+ results.addSink(new StreamITCase.StringSink)
+ env.execute()
+
+ val expected = Seq("1,1", "1,2", "1,1", "2,1", "1,2")
+ assertEquals(expected.sorted, StreamITCase.testResults.sorted)
+ }
+
+ // keyed groupby + non-keyed groupby
+ @Test
+ def testGroupByAndNonKeyedGroupBy(): Unit = {
+
+ val env = StreamExecutionEnvironment.getExecutionEnvironment
+ val tEnv = TableEnvironment.getTableEnvironment(env)
+ StreamITCase.testResults = mutable.MutableList()
+ env.setParallelism(1)
+ env.setStateBackend(getStateBackend)
+
+ val stream = env.fromCollection(data)
+ val table = stream.toTable(tEnv, 'word, 'num)
+ val resultTable = table
+ .groupBy('word)
+ .select('word as 'word, 'num.sum as 'count)
+ .select('count.sum)
+
+ val results = resultTable.toDataStream[Row]
+ results.addSink(new StreamITCase.StringSink)
+ env.execute()
+
+ val expected = Seq("1", "2", "1", "3", "4")
--- End diff --
Could you explain this example?
table.groupBy('word).select('word as 'word, 'num.sum as 'count)
I think this query does not produce retraction
> Implement and turn on the retraction for aggregates
> ---------------------------------------------------
>
> Key: FLINK-6091
> URL: https://issues.apache.org/jira/browse/FLINK-6091
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Shaoxuan Wang
> Assignee: Hequn Cheng
>
> Implement functions for generating and consuming retract messages for
> different aggregates.
> 1. add delete/add property to Row
> 2. implement functions for generating retract messages for unbounded groupBy
> 3. implement functions for handling retract messages for different aggregates.
> 4. handle retraction messages in CommonCorrelate and CommonCalc (retain
> Delete property).
> Note: Currently, only unbounded groupby generates retraction and it is
> working under unbounded and processing time mode. Hence, retraction is only
> supported for unbounded and processing time aggregations so far. We can add
> more retraction support later.
> supported now: unbounded groupby, unbounded and processing time over window
> unsupported now: group window, event time or bounded over window.
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