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https://issues.apache.org/jira/browse/FLINK-9395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941521#comment-16941521
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Ken Geis commented on FLINK-9395:
---------------------------------
Good news. This worked for me using the Blink planner.
> Outer Joins with array types on the outer join input fail
> ---------------------------------------------------------
>
> Key: FLINK-9395
> URL: https://issues.apache.org/jira/browse/FLINK-9395
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Ken Geis
> Priority: Major
> Attachments: JoinTest.java
>
>
> Given a table {{a}} with a single column {{id}}, the following query
> {code:sql}
> SELECT * FROM (SELECT id, ARRAY[id] AS b FROM a) b
> LEFT OUTER JOIN a AS b ON a.id = b.id
> {code}
> fails with the error:
> {noformat}
> org.apache.flink.api.common.InvalidProgramException: Selected sort key is not
> a sortable type
> at
> org.apache.flink.api.java.operators.SortPartitionOperator.ensureSortableKey(SortPartitionOperator.java:145)
> at
> org.apache.flink.api.java.operators.SortPartitionOperator.sortPartition(SortPartitionOperator.java:111)
> at
> org.apache.flink.table.plan.nodes.dataset.DataSetJoin$$anonfun$partitionAndSort$1.apply(DataSetJoin.scala:466)
> at
> org.apache.flink.table.plan.nodes.dataset.DataSetJoin$$anonfun$partitionAndSort$1.apply(DataSetJoin.scala:465)
> at
> scala.collection.IndexedSeqOptimized$class.foldl(IndexedSeqOptimized.scala:57)
> at
> scala.collection.IndexedSeqOptimized$class.foldLeft(IndexedSeqOptimized.scala:66)
> at
> scala.collection.mutable.ArrayOps$ofInt.foldLeft(ArrayOps.scala:234)
> at
> org.apache.flink.table.plan.nodes.dataset.DataSetJoin.partitionAndSort(DataSetJoin.scala:465)
> at
> org.apache.flink.table.plan.nodes.dataset.DataSetJoin.addLeftOuterJoin(DataSetJoin.scala:268)
> at
> org.apache.flink.table.plan.nodes.dataset.DataSetJoin.translateToPlan(DataSetJoin.scala:176)
> at
> org.apache.flink.table.api.BatchTableEnvironment.translate(BatchTableEnvironment.scala:399)
> at
> org.apache.flink.table.api.BatchTableEnvironment.translate(BatchTableEnvironment.scala:378)
> at
> org.apache.flink.table.api.java.BatchTableEnvironment.toDataSet(BatchTableEnvironment.scala:146)
> {noformat}
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