Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1820#discussion_r57188635
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetRel.scala
---
@@ -20,15 +20,15 @@ package org.apache.flink.api.table.plan.nodes.dataset
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.`type`.RelDataType
-import org.apache.calcite.rex._
import org.apache.calcite.sql.`type`.SqlTypeName
import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.api.java.DataSet
import org.apache.flink.api.table.TableConfig
+import org.apache.flink.api.table.plan.nodes.FlinkRel
import scala.collection.JavaConversions._
-trait DataSetRel extends RelNode {
+trait DataSetRel extends RelNode with FlinkRel{
--- End diff --
space after `FlinkRel`
---
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