[GitHub] [flink] twalthr commented on a change in pull request #8162: [FLINK-12174][table] Introduce FlinkAggregateExtractProjectRule and remove extractFieldReferences

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twalthr commented on a change in pull request #8162: [FLINK-12174][table] Introduce FlinkAggregateExtractProjectRule and remove extractFieldReferences
URL: https://github.com/apache/flink/pull/8162#discussion_r275759835
 
 

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 File path: flink-table/flink-table-planner/src/main/java/org/apache/flink/table/plan/rules/logical/FlinkAggregateExtractProjectRule.java
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 @@ -0,0 +1,201 @@
+/*
+ * 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.flink.table.expressions.ResolvedFieldReference;
+import org.apache.flink.table.plan.logical.LogicalWindow;
+import org.apache.flink.table.plan.logical.rel.LogicalWindowAggregate;
+
+import org.apache.calcite.plan.RelOptRuleCall;
+import org.apache.calcite.plan.RelOptRuleOperand;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Aggregate;
+import org.apache.calcite.rel.core.AggregateCall;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.logical.LogicalAggregate;
+import org.apache.calcite.rel.rules.AggregateExtractProjectRule;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.tools.RelBuilder;
+import org.apache.calcite.tools.RelBuilderFactory;
+import org.apache.calcite.util.ImmutableBitSet;
+import org.apache.calcite.util.mapping.Mapping;
+import org.apache.calcite.util.mapping.MappingType;
+import org.apache.calcite.util.mapping.Mappings;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Rule to extract a {@link org.apache.calcite.rel.core.Project}
+ * from a {@link LogicalAggregate} or a {@link LogicalWindowAggregate}
+ * and push it down towards the input.
+ *
+ * <p>Note: Most of the logic in this rule is same with {@link AggregateExtractProjectRule}. The
+ * difference is this rule has also taken the {@link LogicalWindowAggregate} into consideration.
+ * Furthermore, this rule also creates trivial {@link Project}s unless the input node is already
+ * a {@link Project}.
+ */
+public class FlinkAggregateExtractProjectRule extends AggregateExtractProjectRule {
 
 Review comment:
   nit: Can we remove the "Flink" prefix? Every class in this repository could be prefixed with Flink, it does not add information. Maybe `ExtendedAggregateExtractProjectRule`?  

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