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From GitBox <...@apache.org>
Subject [GitHub] [flink] godfreyhe commented on a change in pull request #8148: [FLINK-12161] [table-planner-blink] Supports partial-final optimization for stream group aggregate
Date Fri, 12 Apr 2019 11:38:27 GMT
godfreyhe commented on a change in pull request #8148: [FLINK-12161] [table-planner-blink]
Supports partial-final optimization for stream group aggregate
URL: https://github.com/apache/flink/pull/8148#discussion_r274869130
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/calcite/FlinkRelFactories.scala
 ##########
 @@ -0,0 +1,124 @@
+/*
+ * 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.table.calcite
+
+import org.apache.flink.table.plan.nodes.calcite.RankType.RankType
+import org.apache.flink.table.plan.nodes.calcite.{LogicalExpand, LogicalRank, LogicalSink,
RankRange}
+import org.apache.flink.table.sinks.TableSink
+
+import org.apache.calcite.plan.Contexts
+import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeField}
+import org.apache.calcite.rel.{RelCollation, RelNode}
+import org.apache.calcite.rex.RexNode
+import org.apache.calcite.tools.RelBuilderFactory
+import org.apache.calcite.util.ImmutableBitSet
+
+import java.util
+
+/**
+  * Contains factory interface and default implementation for creating various rel nodes.
+  */
+object FlinkRelFactories {
 
 Review comment:
   This class defines the RelNode factory for extended node(e.g. Rank, Expand),  and `FlinkLogicalRelFactories`
defines the all `FlinkLogicalRel` factories. 
   There is no mandatory requirement to use factory to create logical nodes. However it's
more easy to create a logical node if using `RelBuilderFactory`. And a rule class can be applied
on calcite logical RelNode or Flink logical RelNode if `RelBuilderFactory` instance as its
constructor argument.
   

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