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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 Wed, 21 Jun 2017 13:08:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057446#comment-16057446
] 

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

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

    https://github.com/apache/flink/pull/3715#discussion_r122842288
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/CommonJoin.scala
---
    @@ -0,0 +1,51 @@
    +/*
    + * 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
    +
    +import org.apache.calcite.rel.`type`.RelDataType
    +import org.apache.calcite.rel.core.JoinRelType
    +import org.apache.calcite.rex.RexNode
    +
    +import scala.collection.JavaConverters._
    +
    +trait CommonJoin {
    +
    +  private[flink] def joinSelectionToString(inputType: RelDataType): String = {
    +    inputType.getFieldNames.asScala.toList.mkString(", ")
    +  }
    +
    +  private[flink] def joinConditionToString(
    +    inputType: RelDataType,
    +    joinCondition: RexNode,
    +    expression: (RexNode, List[String], Option[List[RexNode]]) => String): String
= {
    +
    +    val inFields = inputType.getFieldNames.asScala.toList
    +    expression(joinCondition, inFields, None)
    +  }
    +
    +  private[flink] def joinTypeToString(joinType: JoinRelType) = {
    +    joinType match {
    +      case JoinRelType.INNER => "InnerJoin"
    +      case JoinRelType.LEFT=> "LeftOuterJoin"
    +      case JoinRelType.RIGHT => "RightOuterJoin"
    +      case JoinRelType.FULL => "FullOuterJoin"
    +    }
    +  }
    +
    --- End diff --
    
    add `explainTerms` and `toString`


> 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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