[GitHub] [flink] godfreyhe commented on a change in pull request #8520: [FLINK-12600] [table-planner-blink] Introduce planner rules to do deterministic rewriting on RelNode

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godfreyhe commented on a change in pull request #8520: [FLINK-12600] [table-planner-blink] Introduce planner rules to do deterministic rewriting on RelNode
URL: https://github.com/apache/flink/pull/8520#discussion_r287914800
 
 

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 File path: flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/rules/logical/FlinkPruneEmptyRules.scala
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 @@ -0,0 +1,70 @@
+/*
+ * 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.plan.rules.logical
+
+import org.apache.calcite.plan.RelOptRule.{any, none, operand, some}
+import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.core.{Join, JoinRelType, Values}
+
+object FlinkPruneEmptyRules {
 
 Review comment:
   `PruneEmptyRules` in Calcite contains more than one rules, I intend to keep calcite style for this rule.  Maybe later, we need to copy other rules from `PruneEmptyRules` to this file.

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