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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #4471: [FLINK-6094] [table] Implement stream-stream proct...
Date Thu, 23 Nov 2017 16:01:53 GMT
Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4471#discussion_r152742299
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamJoin.scala
---
    @@ -0,0 +1,207 @@
    +/*
    + * 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.datastream
    +
    +import org.apache.calcite.plan._
    +import org.apache.calcite.rel.`type`.RelDataType
    +import org.apache.calcite.rel.core.{JoinInfo, JoinRelType}
    +import org.apache.calcite.rel.{BiRel, RelNode, RelWriter}
    +import org.apache.calcite.rex.RexNode
    +import org.apache.flink.api.common.functions.FlatJoinFunction
    +import org.apache.flink.streaming.api.datastream.DataStream
    +import org.apache.flink.table.api.{StreamQueryConfig, StreamTableEnvironment, TableException}
    +import org.apache.flink.table.codegen.FunctionCodeGenerator
    +import org.apache.flink.table.plan.nodes.CommonJoin
    +import org.apache.flink.table.plan.schema.RowSchema
    +import org.apache.flink.table.runtime.join.DataStreamInnerJoin
    +import org.apache.flink.table.runtime.types.{CRow, CRowTypeInfo}
    +import org.apache.flink.types.Row
    +
    +import scala.collection.JavaConversions._
    +import scala.collection.mutable.ArrayBuffer
    +
    +/**
    +  * RelNode for a non-windowed stream join.
    +  */
    +class DataStreamJoin(
    +    cluster: RelOptCluster,
    +    traitSet: RelTraitSet,
    +    leftNode: RelNode,
    +    rightNode: RelNode,
    +    joinCondition: RexNode,
    +    joinInfo: JoinInfo,
    +    joinType: JoinRelType,
    +    leftSchema: RowSchema,
    +    rightSchema: RowSchema,
    +    schema: RowSchema,
    +    ruleDescription: String)
    +  extends BiRel(cluster, traitSet, leftNode, rightNode)
    +          with CommonJoin
    +          with DataStreamRel {
    +
    +  override def deriveRowType(): RelDataType = schema.relDataType
    +
    +  override def needsUpdatesAsRetraction: Boolean = true
    +
    +  override def copy(traitSet: RelTraitSet, inputs: java.util.List[RelNode]): RelNode
= {
    +    new DataStreamJoin(
    +      cluster,
    +      traitSet,
    +      inputs.get(0),
    +      inputs.get(1),
    +      joinCondition,
    +      joinInfo,
    +      joinType,
    +      leftSchema,
    +      rightSchema,
    +      schema,
    +      ruleDescription)
    +  }
    +
    +  def getJoinInfo: JoinInfo = joinInfo
    +
    +  def getJoinType: JoinRelType = joinType
    +
    +  override def toString: String = {
    +    joinToString(
    +      schema.relDataType,
    +      joinCondition,
    +      joinType,
    +      getExpressionString)
    +  }
    +
    +  override def explainTerms(pw: RelWriter): RelWriter = {
    +    joinExplainTerms(
    +      super.explainTerms(pw),
    +      schema.relDataType,
    +      joinCondition,
    +      joinType,
    +      getExpressionString)
    +  }
    +
    +  override def translateToPlan(
    +      tableEnv: StreamTableEnvironment,
    +      queryConfig: StreamQueryConfig): DataStream[CRow] = {
    +
    +    val config = tableEnv.getConfig
    +    val returnType = schema.typeInfo
    +    val keyPairs = joinInfo.pairs().toList
    +
    +    // get the equality keys
    +    val leftKeys = ArrayBuffer.empty[Int]
    +    val rightKeys = ArrayBuffer.empty[Int]
    +    if (keyPairs.isEmpty) {
    --- End diff --
    
    Should we move the checks in the constructor to fail earlier?


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