Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1820#discussion_r57007432
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/datastream/DataStreamRel.scala
---
@@ -0,0 +1,68 @@
+/*
+ * 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.api.table.plan.nodes.datastream
+
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rex._
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.table.TableConfig
+import org.apache.flink.streaming.api.datastream.DataStream
+import scala.collection.JavaConversions._
+
+trait DataStreamRel extends RelNode {
+
+ /**
+ * Translates the FlinkRelNode into a Flink operator.
+ *
+ * @param config runtime configuration
+ * @param expectedType specifies the type the Flink operator should
return. The type must
+ * have the same arity as the result. For instance,
if the
+ * expected type is a RowTypeInfo this method will
return a DataSet of
+ * type Row. If the expected type is Tuple2, the
operator will return
+ * a Tuple2 if possible. Row otherwise.
+ * @return DataStream of type expectedType or RowTypeInfo
+ */
+ def translateToPlan(
+ config: TableConfig,
+ expectedType: Option[TypeInformation[Any]] = None)
+ : DataStream[Any]
+
+ private[flink] def getExpressionString(
--- End diff --
Same as `DataSetRel.getExpressionString()`? Move to a `FlinkRel` trait?
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