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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6232) Support proctime inner equi-join between two streams in the SQL API
Date Thu, 13 Jul 2017 08:33:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085364#comment-16085364
] 

ASF GitHub Bot commented on FLINK-6232:
---------------------------------------

Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4266#discussion_r126671328
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamWindowJoin.scala
---
    @@ -0,0 +1,187 @@
    +/*
    + * 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.core.{JoinInfo, JoinRelType}
    +import org.apache.calcite.rel.{BiRel, RelNode, RelWriter}
    +import org.apache.calcite.rex.RexNode
    +import org.apache.flink.api.java.functions.NullByteKeySelector
    +import org.apache.flink.streaming.api.datastream.DataStream
    +import org.apache.flink.table.api.{StreamQueryConfig, StreamTableEnvironment, TableException}
    +import org.apache.flink.table.plan.nodes.CommonJoin
    +import org.apache.flink.table.plan.schema.RowSchema
    +import org.apache.flink.table.runtime.join.{ProcTimeWindowInnerJoin, WindowJoinUtil}
    +import org.apache.flink.table.runtime.types.{CRow, CRowTypeInfo}
    +import org.apache.flink.table.updateutils.UpdateCheckUtils
    +
    +/**
    +  * Flink RelNode which matches along with JoinOperator and its related operations.
    +  */
    +class DataStreamWindowJoin(
    +    cluster: RelOptCluster,
    +    traitSet: RelTraitSet,
    +    leftNode: RelNode,
    +    rightNode: RelNode,
    +    joinCondition: RexNode,
    +    joinType: JoinRelType,
    +    leftSchema: RowSchema,
    +    rightSchema: RowSchema,
    +    schema: RowSchema,
    +    isRowTime: Boolean,
    +    leftLowerBound: Long,
    +    leftUpperBound: Long,
    +    remainCondition: Option[RexNode],
    +    ruleDescription: String)
    +  extends BiRel(cluster, traitSet, leftNode, rightNode)
    +    with CommonJoin
    +    with DataStreamRel {
    +
    +  override def deriveRowType() = schema.logicalType
    +
    +  override def copy(traitSet: RelTraitSet, inputs: java.util.List[RelNode]): RelNode
= {
    +    new DataStreamWindowJoin(
    +      cluster,
    +      traitSet,
    +      inputs.get(0),
    +      inputs.get(1),
    +      joinCondition,
    +      joinType,
    +      leftSchema,
    +      rightSchema,
    +      schema,
    +      isRowTime,
    +      leftLowerBound,
    +      leftUpperBound,
    +      remainCondition,
    +      ruleDescription)
    +  }
    +
    +  override def toString: String = {
    +    joinToString(
    +      schema.logicalType,
    +      joinCondition,
    +      joinType,
    +      getExpressionString)
    +  }
    +
    +  override def explainTerms(pw: RelWriter): RelWriter = {
    +    joinExplainTerms(
    +      super.explainTerms(pw),
    +      schema.logicalType,
    +      joinCondition,
    +      joinType,
    +      getExpressionString)
    +  }
    +
    +  override def translateToPlan(
    +      tableEnv: StreamTableEnvironment,
    +      queryConfig: StreamQueryConfig): DataStream[CRow] = {
    +
    +    val config = tableEnv.getConfig
    +
    +    val isLeftAppendOnly = UpdateCheckUtils.isAppendOnly(left)
    +    val isRightAppendOnly = UpdateCheckUtils.isAppendOnly(right)
    +    if (!isLeftAppendOnly || !isRightAppendOnly) {
    +      throw new TableException(
    +        "Windowed stream join does not support updates.")
    +    }
    +
    +    val leftDataStream = left.asInstanceOf[DataStreamRel].translateToPlan(tableEnv, queryConfig)
    +    val rightDataStream = right.asInstanceOf[DataStreamRel].translateToPlan(tableEnv,
queryConfig)
    +
    +    // get the equality keys and other condition
    +    val joinInfo = JoinInfo.of(leftNode, rightNode, joinCondition)
    +    val leftKeys = joinInfo.leftKeys.toIntArray
    +    val rightKeys = joinInfo.rightKeys.toIntArray
    +
    +    // generate join function
    +    val joinFunction =
    +    WindowJoinUtil.generateJoinFunction(
    +      config,
    +      joinType,
    +      leftSchema.physicalTypeInfo,
    +      rightSchema.physicalTypeInfo,
    +      schema,
    +      remainCondition,
    +      ruleDescription)
    +
    +    joinType match {
    +      case JoinRelType.INNER =>
    +        isRowTime match {
    --- End diff --
    
    I think using a `if (isRowTime) else ` here is more simple.


> Support proctime inner equi-join between two streams in the SQL API
> -------------------------------------------------------------------
>
>                 Key: FLINK-6232
>                 URL: https://issues.apache.org/jira/browse/FLINK-6232
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: hongyuhong
>            Assignee: hongyuhong
>
> The goal of this issue is to add support for inner equi-join on proc time streams to
the SQL interface.
> Queries similar to the following should be supported:
> {code}
> SELECT o.proctime, o.productId, o.orderId, s.proctime AS shipTime 
> FROM Orders AS o 
> JOIN Shipments AS s 
> ON o.orderId = s.orderId 
> AND o.proctime BETWEEN s.proctime AND s.proctime + INTERVAL '1' HOUR;
> {code}
> The following restrictions should initially apply:
> * The join hint only support inner join
> * The ON clause should include equi-join condition
> * The time-condition {{o.proctime BETWEEN s.proctime AND s.proctime + INTERVAL '1' HOUR}}
only can use proctime that is a system attribute, the time condition only support bounded
time range like {{o.proctime BETWEEN s.proctime - INTERVAL '1' HOUR AND s.proctime + INTERVAL
'1' HOUR}}, not support unbounded like {{o.proctime > s.protime}},  and  should include
both two stream's proctime attribute, {{o.proctime between proctime() and proctime() + 1}}
should also not be supported.
> This issue includes:
> * Design of the DataStream operator to deal with stream join
> * Translation from Calcite's RelNode representation (LogicalJoin). 



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