xuyangzhong commented on code in PR #27828: URL: https://github.com/apache/flink/pull/27828#discussion_r2992763130
########## flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/join/deltajoin/CascadedLookupHandler.java: ########## @@ -0,0 +1,322 @@ +/* + * 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.runtime.operators.join.deltajoin; + +import org.apache.flink.api.common.functions.FlatMapFunction; +import org.apache.flink.api.common.functions.OpenContext; +import org.apache.flink.api.common.functions.RuntimeContext; +import org.apache.flink.api.common.functions.util.FunctionUtils; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.utils.JoinedRowData; +import org.apache.flink.table.runtime.generated.FilterCondition; +import org.apache.flink.table.runtime.generated.GeneratedFilterCondition; +import org.apache.flink.table.runtime.generated.GeneratedFunction; +import org.apache.flink.table.runtime.keyselector.RowDataKeySelector; +import org.apache.flink.table.runtime.typeutils.RowDataSerializer; +import org.apache.flink.table.types.DataType; +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nullable; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; + +/** + * This handler represents one of the lookup actions when performing cascaded lookups on multi + * dimension tables. + * + * <p>For example, if the lookup chain is `[D -> A, A -> B, (A, B) -> C]`, there are three {@link + * CascadedLookupHandler}, each representing one of the lookup actions within the sequence. + */ +public class CascadedLookupHandler extends LookupHandlerBase { + + private static final long serialVersionUID = 1L; + + private static final Logger LOG = LoggerFactory.getLogger(CascadedLookupHandler.class); + + // used for debug and start with 1 + protected final int id; + private @Nullable final GeneratedFilterCondition generatedRemainingCondition; + private final RowDataKeySelector streamSideLookupKeySelector; + private final boolean leftLookupRight; + + private @Nullable transient FilterCondition remainingCondition; + private transient Map<RowData, List<RowData>> allInputsWithLookupKey; + private transient Map<RowData, Collection<RowData>> lookupResults; + + protected @Nullable transient Integer totalNumShouldBeHandledThisRound = null; + protected @Nullable transient Integer handledNum = null; + + public CascadedLookupHandler( + int id, + DataType streamSideType, + DataType lookupResultType, + DataType lookupSidePassThroughCalcType, + RowDataSerializer lookupSidePassThroughCalcRowSerializer, + @Nullable GeneratedFunction<FlatMapFunction<RowData, RowData>> lookupSideGeneratedCalc, + @Nullable GeneratedFilterCondition generatedRemainingCondition, + RowDataKeySelector streamSideLookupKeySelector, + int[] ownedSourceOrdinals, + int ownedLookupOrdinal, + boolean leftLookupRight) { + super( + streamSideType, + lookupResultType, + lookupSidePassThroughCalcType, + lookupSidePassThroughCalcRowSerializer, + lookupSideGeneratedCalc, + ownedSourceOrdinals, + ownedLookupOrdinal, + "CascadedLookupHandler-" + id); + this.id = id; + this.generatedRemainingCondition = generatedRemainingCondition; + this.streamSideLookupKeySelector = streamSideLookupKeySelector; + + if (leftLookupRight) { + Preconditions.checkArgument( + Arrays.stream(ownedSourceOrdinals).allMatch(i -> i < ownedLookupOrdinal)); + } else { + Preconditions.checkArgument( + Arrays.stream(ownedSourceOrdinals).allMatch(i -> i > ownedLookupOrdinal)); + } + this.leftLookupRight = leftLookupRight; + } + + @Override + public void setNext(@Nullable DeltaJoinHandlerBase next) { + super.setNext(next); + + Preconditions.checkArgument( + next != null, "This cascaded lookup handler must have a concrete handler after it"); + } + + @Override + public void open(OpenContext openContext, DeltaJoinHandlerContext handlerContext) + throws Exception { + super.open(openContext, handlerContext); + + RuntimeContext runtimeContext = handlerContext.getRuntimeContext(); + + if (generatedRemainingCondition != null) { + this.remainingCondition = + generatedRemainingCondition.newInstance( + runtimeContext.getUserCodeClassLoader()); + FunctionUtils.setFunctionRuntimeContext(remainingCondition, runtimeContext); + FunctionUtils.openFunction(remainingCondition, openContext); + } + + this.lookupResults = new HashMap<>(); + this.allInputsWithLookupKey = new HashMap<>(); + + Preconditions.checkState( + next != null, "This cascaded lookup handler must have a concrete handler after it"); + } + + @Override + public void asyncHandle() throws Exception { + Preconditions.checkState( + totalNumShouldBeHandledThisRound == null && handledNum == null, + "This handler is handled without being reset"); + + Collection<RowData> allSourceRowData = + handlerContext.getSharedMultiInputRowDataBuffer().getData(ownedSourceOrdinals); + + for (RowData input : allSourceRowData) { + RowData lookupKey = streamSideLookupKeySelector.getKey(input); + allInputsWithLookupKey.compute( + lookupKey, + (k, v) -> { + if (v == null) { + v = new ArrayList<>(); + } + v.add(input); + return v; + }); + } + + totalNumShouldBeHandledThisRound = allInputsWithLookupKey.size(); + handledNum = 0; + + if (LOG.isDebugEnabled()) { + LOG.debug( + "Begin to lookup from {} to {}, total round: {}, current round: {}", + Arrays.toString(ownedSourceOrdinals), + ownedLookupOrdinal, + totalNumShouldBeHandledThisRound, + handledNum); + } + + if (allSourceRowData.isEmpty()) { + finish(); + return; + } + + for (List<RowData> inputsOnThisLookupKey : allInputsWithLookupKey.values()) { + // pick the first row as input to lookup + RowData chosenToLookupInput = inputsOnThisLookupKey.get(0); + fetcher.asyncInvoke(chosenToLookupInput, createLookupResultFuture(chosenToLookupInput)); + } + } + + @Override + protected void completeResultsInMailbox(RowData input, Collection<RowData> result) { + Preconditions.checkState( + totalNumShouldBeHandledThisRound != null && handledNum != null, + "This handler is completed without being handled"); + + lookupResults.put(input, result); + + handledNum++; + + if (LOG.isDebugEnabled()) { + LOG.debug( + "End to lookup from {} to {}, total round: {}, next round: {}", + Arrays.toString(ownedSourceOrdinals), + ownedLookupOrdinal, + totalNumShouldBeHandledThisRound, + handledNum); + } + + if (noFurtherInput()) { + if (LOG.isDebugEnabled()) { + LOG.debug( + "There is no further input when looking up from {} to {}, total round: {}, next round: {}", + Arrays.toString(ownedSourceOrdinals), + ownedLookupOrdinal, + totalNumShouldBeHandledThisRound, + handledNum); + } + try { + finish(); + } catch (Exception t) { + LOG.error("Error happened in the lookup chain when finishing", t); + completeExceptionally(t); + } + } + } + + private boolean noFurtherInput() { + Preconditions.checkState( Review Comment: Great catch! 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