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 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
>
>
>
