beyond1920 commented on a change in pull request #16025: URL: https://github.com/apache/flink/pull/16025#discussion_r660318419
########## File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/rules/physical/stream/SimplifyWindowTableFunctionRule.java ########## @@ -0,0 +1,355 @@ +/* + * 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.planner.plan.rules.physical.stream; + +import org.apache.flink.table.api.TableException; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalCalc; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalExchange; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalWindowJoin; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalWindowRank; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalWindowTableFunction; + +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.plan.RelOptUtil; +import org.apache.calcite.plan.RelRule; +import org.apache.calcite.rel.RelNode; + +import java.util.Collections; +import java.util.List; + +/** + * Planner rule that tries to simplify emit behavior of {@link StreamPhysicalWindowTableFunction} to + * emit per record instead of emit after watermark passed window end if the successor node is {@link + * StreamPhysicalWindowRank} or {@link StreamPhysicalWindowJoin} which with + * rowtime-WindowingStrategy. + */ +public class SimplifyWindowTableFunctionRule + extends RelRule<SimplifyWindowTableFunctionRule.Config> { + + public static final RelOptRule WITH_WINDOW_RANK = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithWindowRank") + .as(Config.class) + .withWindowRank() + .toRule(); + + public static final RelOptRule WITH_CALC_WINDOW_RANK = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithCalcWindowRank") + .as(Config.class) + .withCalcWindowRank() + .toRule(); + + public static final RelOptRule WITH_WINDOW_JOIN = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithWindowJoin") + .as(Config.class) + .withWindowJoin() + .toRule(); + + public static final RelOptRule WITH_LEFT_CALC_WINDOW_JOIN = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithLeftCalcWindowJoin") + .as(Config.class) + .withLeftCalcWindowJoin() + .toRule(); + + public static final RelOptRule WITH_RIGHT_CALC_WINDOW_JOIN = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithRightCalcWindowJoin") + .as(Config.class) + .withRightCalcWindowJoin() + .toRule(); + + public static final RelOptRule WITH_LEFT_RIGHT_CALC_WINDOW_JOIN = + Config.EMPTY + .withDescription("SimplifyWindowTableFunctionRuleWithLeftRightCalcWindowJoin") + .as(Config.class) + .withLeftRightCalcWindowJoin() + .toRule(); + + public SimplifyWindowTableFunctionRule(Config config) { + super(config); + } + + @Override + public boolean matches(RelOptRuleCall call) { + List<RelNode> rels = call.getRelList(); + final RelNode node = rels.get(0); + if (node instanceof StreamPhysicalWindowRank) { + final int windowTVFIdx = rels.size() - 1; + final StreamPhysicalWindowTableFunction windowTVF = + (StreamPhysicalWindowTableFunction) rels.get(windowTVFIdx); + return needSimplify(windowTVF); + } else if (node instanceof StreamPhysicalWindowJoin) { + RelNode leftWindowTVFRel; + if (call.rule == WITH_WINDOW_JOIN) { + leftWindowTVFRel = rels.get(2); + } else if (call.rule == WITH_RIGHT_CALC_WINDOW_JOIN) { + leftWindowTVFRel = rels.get(2); + } else if (call.rule == WITH_LEFT_CALC_WINDOW_JOIN) { + leftWindowTVFRel = rels.get(3); + } else if (call.rule == WITH_LEFT_RIGHT_CALC_WINDOW_JOIN) { + leftWindowTVFRel = rels.get(3); + } else { + throw new TableException("This should never happen. Please file an issue."); + } + final StreamPhysicalWindowTableFunction leftWindowTVF = + (StreamPhysicalWindowTableFunction) leftWindowTVFRel; + final StreamPhysicalWindowTableFunction rightWindowTVF = + (StreamPhysicalWindowTableFunction) rels.get(rels.size() - 1); + return needSimplify(leftWindowTVF) || needSimplify(rightWindowTVF); + } else { + throw new IllegalStateException( + this.getClass().getName() + + " matches a wrong relation tree: " + + RelOptUtil.toString(node)); + } + } + + @Override + public void onMatch(RelOptRuleCall call) { + List<RelNode> rels = call.getRelList(); + final RelNode node = rels.get(0); + if (node instanceof StreamPhysicalWindowRank) { + RelNode newTree = rebuild(rels); + call.transformTo(newTree); + } else if (node instanceof StreamPhysicalWindowJoin) { + RelNode newLeft; + RelNode newRight; + if (call.rule == WITH_WINDOW_JOIN) { Review comment: Yes, the rule does not support `WindowAggregate` because for window table function + window Aggregate would be matched by `PullUpWindowTableFunctionIntoWindowAggregateRule`. -- This is an automated message from the Apache Git Service. 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