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From GitBox <...@apache.org>
Subject [GitHub] [flink] godfreyhe commented on a change in pull request #7969: [FLINK-11896] [table-planner-blink] Introduce stream physical nodes
Date Fri, 15 Mar 2019 03:01:24 GMT
godfreyhe commented on a change in pull request #7969: [FLINK-11896] [table-planner-blink]
Introduce stream physical nodes
URL: https://github.com/apache/flink/pull/7969#discussion_r265836012
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/nodes/physical/stream/StreamExecFirstLastRow.scala
 ##########
 @@ -0,0 +1,73 @@
+/*
+ * 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.plan.nodes.physical.stream
+
+import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
+import org.apache.calcite.rel.`type`.RelDataType
+import org.apache.calcite.rel.{RelNode, RelWriter, SingleRel}
+
+import java.util
+
+import scala.collection.JavaConversions._
+
+/**
+  * Stream physical RelNode which deduplicate on keys and keeps only first row or last row.
+  * <p>NOTES: only supports sort on proctime now.
+  */
+class StreamExecFirstLastRow(
+    cluster: RelOptCluster,
+    traitSet: RelTraitSet,
+    inputRel: RelNode,
+    uniqueKeys: Array[Int],
+    isRowtime: Boolean,
+    isLastRowMode: Boolean)
+  extends SingleRel(cluster, traitSet, inputRel)
+  with StreamPhysicalRel {
+
+  def getUniqueKeys: Array[Int] = uniqueKeys
+
+  override def producesUpdates: Boolean = isLastRowMode
+
+  override def consumesRetractions: Boolean = true
+
+  override def needsUpdatesAsRetraction(input: RelNode): Boolean = true
+
+  override def deriveRowType(): RelDataType = getInput.getRowType
+
+  override def copy(traitSet: RelTraitSet, inputs: util.List[RelNode]): RelNode = {
+    new StreamExecFirstLastRow(
+      cluster,
+      traitSet,
+      inputs.get(0),
+      uniqueKeys,
+      isRowtime,
+      isLastRowMode)
+  }
+
+  override def explainTerms(pw: RelWriter): RelWriter = {
+    val fieldNames = getRowType.getFieldNames
+    val orderString = if (isRowtime) "ROWTIME" else "PROCTIME"
+    super.explainTerms(pw)
+      .item("key", uniqueKeys.map(fieldNames.get).mkString(", "))
+      .item("select", fieldNames.mkString(", "))
+      .item("order", orderString)
+      .item("mode", if (isLastRowMode) "LastRow" else "FirstRow")
 
 Review comment:
   field names is needless if the `RelNode` does not change output type

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