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https://issues.apache.org/jira/browse/FLINK-8577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694623#comment-16694623
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ASF GitHub Bot commented on FLINK-8577:
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dianfu commented on a change in pull request #6787: [FLINK-8577][table]
Implement proctime DataStream to Table upsert conversion
URL: https://github.com/apache/flink/pull/6787#discussion_r235320988
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/LastRowProcessFunction.scala
##########
@@ -0,0 +1,104 @@
+/*
+ * 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.runtime
+
+import org.apache.flink.api.common.state.{ValueState, ValueStateDescriptor}
+import org.apache.flink.api.java.typeutils.RowTypeInfo
+import org.apache.flink.configuration.Configuration
+import org.apache.flink.streaming.api.functions.ProcessFunction
+import org.apache.flink.table.api.StreamQueryConfig
+import org.apache.flink.table.runtime.aggregate.ProcessFunctionWithCleanupState
+import org.apache.flink.table.runtime.types.CRow
+import org.apache.flink.table.util.Logging
+import org.apache.flink.types.Row
+import org.apache.flink.util.Collector
+
+/**
+ * Function used to handle upsert inputs. Output a retract message if there
is a new update.
+ *
+ * @param rowTypeInfo the output row type info.
+ * @param queryConfig the configuration for the query.
+ */
+class LastRowProcessFunction(
+ private val rowTypeInfo: RowTypeInfo,
+ private val queryConfig: StreamQueryConfig)
+ extends ProcessFunctionWithCleanupState[CRow, CRow](queryConfig)
+ with Logging {
+
+ private var prevRow: CRow = _
+ // stores the accumulators
+ private var state: ValueState[Row] = _
Review comment:
state and prevRow can be transient.
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> Implement proctime DataStream to Table upsert conversion.
> ---------------------------------------------------------
>
> Key: FLINK-8577
> URL: https://issues.apache.org/jira/browse/FLINK-8577
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
> Labels: pull-request-available
>
> Api will looks like:
> {code:java}
> DataStream[(String, Long, Int)] input = ???
> // upsert with keyTable
> table = tEnv.upsertFromStream(input, 'a, 'b, 'c.key)
> // upsert without key -> single row tableTable
> table = tEnv.upsertFromStream(input, 'a, 'b, 'c){code}
> A simple design
> [doc|https://docs.google.com/document/d/1yMEi9xkm3pNYNmmZykbLzqtKjFVezaWe0y7Xqd0c1zE/edit?usp=sharing]
> about this subtask.
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