snuyanzin commented on code in PR #26780: URL: https://github.com/apache/flink/pull/26780#discussion_r2201446512
########## flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/physical/stream/FlinkMarkChangelogNormaliseProgram.java: ########## @@ -0,0 +1,150 @@ +/* + * 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.planner.calcite.FlinkRexBuilder; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalCalc; +import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalChangelogNormalize; +import org.apache.flink.table.planner.plan.optimize.program.FlinkOptimizeProgram; +import org.apache.flink.table.planner.plan.optimize.program.StreamOptimizeContext; +import org.apache.flink.table.planner.plan.utils.FlinkRexUtil; + +import org.apache.calcite.plan.RelOptUtil; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.core.TableScan; +import org.apache.calcite.rex.RexBuilder; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.rex.RexProgram; +import org.apache.calcite.rex.RexUtil; + +import java.util.ArrayList; +import java.util.Comparator; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; + +/** + * A {@link FlinkOptimizeProgram} that marks changelog normalize nodes using the same source and + * determines common filters if any. + */ +public class FlinkMarkChangelogNormaliseProgram + implements FlinkOptimizeProgram<StreamOptimizeContext> { + @Override + public RelNode optimize(RelNode root, StreamOptimizeContext context) { + final Map<TableScan, List<ChangelogNormalizeContext>> tableScansToChangelogNormalize = + new HashMap<>(); + final FlinkRexBuilder rexBuilder = + new FlinkRexBuilder(context.getFlinkRelBuilder().getTypeFactory()); + for (RelNode relNode : root.getInputs()) { + gatherTableScanToChangelogNormalizeMap( + relNode, tableScansToChangelogNormalize, rexBuilder); + } + + for (Map.Entry<TableScan, List<ChangelogNormalizeContext>> entry : + tableScansToChangelogNormalize.entrySet()) { + if (entry.getValue().size() <= 1) { + continue; + } + + List<ChangelogNormalizeContext> list = entry.getValue(); + list.sort(Comparator.comparingInt(o -> o.rexNodes.size())); + Set<RexNode> common = new HashSet<>(list.get(0).rexNodes); + + for (int i = 1; i < list.size() && !common.isEmpty(); i++) { + common.retainAll(list.get(i).rexNodes); + } + + for (ChangelogNormalizeContext ctx : entry.getValue()) { + ctx.getChangelogNormalize().markSourceReuse(); + if (!common.isEmpty()) { + ctx.getChangelogNormalize().setCommonFilter(common.toArray(new RexNode[0])); + } + } + } + return root; + } + + private void gatherTableScanToChangelogNormalizeMap( + RelNode curRelNode, + Map<TableScan, List<ChangelogNormalizeContext>> map, + FlinkRexBuilder rexBuilder) { + for (RelNode input : curRelNode.getInputs()) { + if (input instanceof StreamPhysicalChangelogNormalize) { + StreamPhysicalChangelogNormalize changelogNormalize = + (StreamPhysicalChangelogNormalize) input; + if (curRelNode instanceof StreamPhysicalCalc) { + StreamPhysicalCalc calc = (StreamPhysicalCalc) curRelNode; + final List<RexNode> list = getConditions(calc, rexBuilder); + gatherTableScanToChangelogNormalizeMap( + input, ChangelogNormalizeContext.of(changelogNormalize, list), map); + } + } else { + gatherTableScanToChangelogNormalizeMap(input, map, rexBuilder); + } + } + } + + private List<RexNode> getConditions(StreamPhysicalCalc calc, RexBuilder rexBuilder) { + final RexProgram program = calc.getProgram(); + if (program.getCondition() != null) { + final RexNode rexNode = + RexUtil.toCnf( + rexBuilder, + FlinkRexUtil.expandSearch( + rexBuilder, program.expandLocalRef(program.getCondition()))); + return RelOptUtil.conjunctions(rexNode); + } + return List.of(); + } + + private void gatherTableScanToChangelogNormalizeMap( + RelNode cur, + ChangelogNormalizeContext context, + Map<TableScan, List<ChangelogNormalizeContext>> currentMap) { + if (cur instanceof TableScan) { + currentMap.computeIfAbsent((TableScan) cur, (k) -> new ArrayList<>()).add(context); + } else { + for (RelNode relNode : cur.getInputs()) { + gatherTableScanToChangelogNormalizeMap(relNode, context, currentMap); + } + } + } + + private static class ChangelogNormalizeContext { + private final StreamPhysicalChangelogNormalize changelogNormalize; + private final List<RexNode> rexNodes; + + public ChangelogNormalizeContext( + StreamPhysicalChangelogNormalize changelogNormalize, List<RexNode> rexNodes) { + this.changelogNormalize = changelogNormalize; + this.rexNodes = rexNodes; + } + + public static ChangelogNormalizeContext of( + StreamPhysicalChangelogNormalize changelogNormalize, List<RexNode> rexNodes) { + return new ChangelogNormalizeContext(changelogNormalize, rexNodes); + } + + public StreamPhysicalChangelogNormalize getChangelogNormalize() { + return changelogNormalize; + } Review Comment: done -- This is an automated message from the Apache Git Service. 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