flink tableapi inner join exception

[刘 文]

Exception in thread "main" org.apache.flink.table.api.ValidationException: join relations with ambiguous names: id, name, value

at org.apache.flink.table.plan.logical.LogicalNode.failValidation(LogicalNode.scala:156)

at org.apache.flink.table.plan.logical.Join.validate(operators.scala:463)

at org.apache.flink.table.api.Table.join(table.scala:589)

at org.apache.flink.table.api.Table.join(table.scala:397)

at com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin.Run$.main(Run.scala:26)

at com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin.Run.main(Run.scala)

————————————————————————————————————————————————————

package com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin

import org.apache.flink.api.scala.{ExecutionEnvironment, _}
import org.apache.flink.table.api.TableEnvironment
import org.apache.flink.table.api.scala._

object Run {


  def main(args: Array[String]): Unit = {

    val env = ExecutionEnvironment.getExecutionEnvironment
    val tableEnv = TableEnvironment.getTableEnvironment(env)

    val dataSet = env.fromElements( (1,"a",10),(2,"b",20), (3,"c",30) )
    val dataSet2 = env.fromElements( (1,"a",10),(20,"b",20), (30,"c",30) )



    //从dataset转化为 table
    val table = tableEnv.fromDataSet(dataSet,'id,'name,'value)
    val table2 = tableEnv.fromDataSet(dataSet2,'id,'name,'value)



   table.join(table2).where(" id = id ").first(1000).print()






  }

}

Best,

thinktothings

[Xingcan Cui]

Hi,

As the message said, some columns share the same names. You could first rename the columns of one table with the `as` operation [1].

Best,

Xingcan

[1] https://ci.apache.org/projects/flink/flink-docs-master/dev/table/tableApi.html#scan-projection-and-filter 

On Mar 15, 2019, at 9:03 AM, 刘 文 <[hidden email]> wrote:

Exception in thread "main" org.apache.flink.table.api.ValidationException: join relations with ambiguous names: id, name, value

at org.apache.flink.table.plan.logical.LogicalNode.failValidation(LogicalNode.scala:156)

at org.apache.flink.table.plan.logical.Join.validate(operators.scala:463)

at org.apache.flink.table.api.Table.join(table.scala:589)

at org.apache.flink.table.api.Table.join(table.scala:397)

at com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin.Run$.main(Run.scala:26)

at com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin.Run.main(Run.scala)

————————————————————————————————————————————————————

package com.opensourceteams.module.bigdata.flink.example.tableapi.operation.innerJoin

import org.apache.flink.api.scala.{ExecutionEnvironment, _}
import org.apache.flink.table.api.TableEnvironment
import org.apache.flink.table.api.scala._

object Run {


  def main(args: Array[String]): Unit = {

    val env = ExecutionEnvironment.getExecutionEnvironment
    val tableEnv = TableEnvironment.getTableEnvironment(env)

    val dataSet = env.fromElements( (1,"a",10),(2,"b",20), (3,"c",30) )
    val dataSet2 = env.fromElements( (1,"a",10),(20,"b",20), (30,"c",30) )



    //从dataset转化为 table
    val table = tableEnv.fromDataSet(dataSet,'id,'name,'value)
    val table2 = tableEnv.fromDataSet(dataSet2,'id,'name,'value)



   table.join(table2).where(" id = id ").first(1000).print()






  }

}

Best,

thinktothings