lincoln-lil commented on code in PR #21219: URL: https://github.com/apache/flink/pull/21219#discussion_r1053906856
########## flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/EventTimeTemporalJoinRewriteRule.java: ########## @@ -0,0 +1,477 @@ +/* + * 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.logical; + +import org.apache.flink.table.api.TableException; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCalc; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalJoin; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalRel; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalSnapshot; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalTableSourceScan; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalWatermarkAssigner; +import org.apache.flink.table.planner.plan.schema.TimeIndicatorRelDataType; +import org.apache.flink.table.planner.plan.utils.TemporalTableJoinUtil; + +import org.apache.flink.shaded.curator5.org.apache.curator.shaded.com.google.common.collect.Lists; + +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.plan.RelRule; +import org.apache.calcite.plan.hep.HepRelVertex; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.tools.RuleSet; +import org.apache.calcite.tools.RuleSets; + +/** + * Traverses an event time temporal table join {@link RelNode} tree and update the right child to + * set {@link FlinkLogicalTableSourceScan}'s eventTimeSnapshot property to true which will prevent + * it generating a new StreamPhysicalChangelogNormalize later. + * + * <p>the match patterns are as following(8 variants, the three `Calc` nodes are all optional): + * + * <pre>{@code + * Join (event time temporal) + * / \ + * RelNode [Calc] + * \ + * Snapshot + * \ + * [Calc] + * \ + * WatermarkAssigner + * \ + * [Calc] + * \ + * TableScan + * }</pre> + * + * <p>Note: This rule can only be used in a separate {@link org.apache.calcite.plan.hep.HepProgram} + * after `LOGICAL_REWRITE` rule sets are applied for now. + */ +public class EventTimeTemporalJoinRewriteRule + extends RelRule<EventTimeTemporalJoinRewriteRule.Config> { + + public static final RuleSet EVENT_TIME_TEMPORAL_JOIN_REWRITE_RULES = + RuleSets.ofList( + Config.JOIN_CALC_SNAPSHOT_CALC_WMA_CALC_TS.toRule(), + Config.JOIN_CALC_SNAPSHOT_CALC_WMA_TS.toRule(), + Config.JOIN_CALC_SNAPSHOT_WMA_CALC_TS.toRule(), + Config.JOIN_CALC_SNAPSHOT_WMA_TS.toRule(), + Config.JOIN_SNAPSHOT_CALC_WMA_CALC_TS.toRule(), + Config.JOIN_SNAPSHOT_CALC_WMA_TS.toRule(), + Config.JOIN_SNAPSHOT_WMA_CALC_TS.toRule(), + Config.JOIN_SNAPSHOT_WMA_TS.toRule()); + + public EventTimeTemporalJoinRewriteRule(Config config) { + super(config); + } + + @Override + public boolean matches(RelOptRuleCall call) { + FlinkLogicalJoin join = call.rel(0); + RexNode joinCondition = join.getCondition(); + // only matches event time temporal join + return joinCondition != null + && TemporalTableJoinUtil.isEventTimeTemporalJoin(joinCondition); + } + + @Override + public void onMatch(RelOptRuleCall call) { + FlinkLogicalJoin join = call.rel(0); + FlinkLogicalRel joinRightChild = call.rel(2); + RelNode newRight = transmitSnapshotRequirement(joinRightChild); + call.transformTo( + join.copy(join.getTraitSet(), Lists.newArrayList(join.getLeft(), newRight))); + } + + private RelNode transmitSnapshotRequirement(RelNode node) { + if (node instanceof FlinkLogicalCalc) { + final FlinkLogicalCalc calc = (FlinkLogicalCalc) node; + // filter is not allowed because it will corrupt the version table + if (null != calc.getProgram().getCondition()) { + throw new TableException( + "Filter is not allowed for right changelog input of event time temporal join," + + " it will corrupt the versioning of data. Please consider removing the filter before joining."); + } + + final RelNode child = calc.getInput(); + final RelNode newChild = transmitSnapshotRequirement(child); + if (newChild != child) { + return calc.copy(calc.getTraitSet(), newChild, calc.getProgram()); + } + return calc; + } + if (node instanceof FlinkLogicalSnapshot) { + final FlinkLogicalSnapshot snapshot = (FlinkLogicalSnapshot) node; + assert isEventTime(snapshot.getPeriod().getType()); + final RelNode child = snapshot.getInput(); + final RelNode newChild = transmitSnapshotRequirement(child); + if (newChild != child) { + return snapshot.copy(snapshot.getTraitSet(), newChild, snapshot.getPeriod()); + } + return snapshot; + } + if (node instanceof HepRelVertex) { + return transmitSnapshotRequirement(((HepRelVertex) node).getCurrentRel()); + } + if (node instanceof FlinkLogicalWatermarkAssigner) { + final FlinkLogicalWatermarkAssigner wma = (FlinkLogicalWatermarkAssigner) node; + final RelNode child = wma.getInput(); + final RelNode newChild = transmitSnapshotRequirement(child); + if (newChild != child) { + return wma.copy( + wma.getTraitSet(), newChild, wma.rowtimeFieldIndex(), wma.watermarkExpr()); + } + return wma; + } + if (node instanceof FlinkLogicalTableSourceScan) { + final FlinkLogicalTableSourceScan ts = (FlinkLogicalTableSourceScan) node; + // update eventTimeSnapshotRequired to true + return ts.copy(ts.getTraitSet(), ts.relOptTable(), true); + } + return node; + } + + private boolean isEventTime(RelDataType period) { + if (period instanceof TimeIndicatorRelDataType) { + return ((TimeIndicatorRelDataType) period).isEventTime(); + } + return false; + } + + /** + * Configuration for {@link EventTimeTemporalJoinRewriteRule}. + * + * <p>Operator tree: + * + * <pre>{@code + * Join (event time temporal) + * / \ + * RelNode [Calc] + * \ + * Snapshot + * \ + * [Calc] + * \ + * WatermarkAssigner + * \ + * [Calc] + * \ + * TableScan + * }</pre> + * + * <p>8 variants: + * + * <ul> + * <li>JOIN_CALC_SNAPSHOT_CALC_WMA_CALC_TS + * <li>JOIN_CALC_SNAPSHOT_CALC_WMA_TS + * <li>JOIN_CALC_SNAPSHOT_WMA_CALC_TS + * <li>JOIN_CALC_SNAPSHOT_WMA_TS + * <li>JOIN_SNAPSHOT_CALC_WMA_CALC_TS + * <li>JOIN_SNAPSHOT_CALC_WMA_TS + * <li>JOIN_SNAPSHOT_WMA_CALC_TS + * <li>JOIN_SNAPSHOT_WMA_TS + * </ul> + * + * <p>Note: the binary form of the numeric suffix is consistent with the arrangement of the + * three optional calc nodes, e.g., '5' corresponds to '101' in binary, representing the + * existence of the 1st and 3rd calc nodes. + */ + public interface Config extends RelRule.Config { + RelRule.Config JOIN_CALC_SNAPSHOT_CALC_WMA_CALC_TS = + EMPTY.withDescription("EventTimeTemporalJoinRewriteRule7") Review Comment: make sense to me, updated -- This is an automated message from the Apache Git Service. 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