xuyangzhong commented on a change in pull request #17734: URL: https://github.com/apache/flink/pull/17734#discussion_r750818825
########## File path: flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/join/interval/SemiAntiTimeIntervalJoin.java ########## @@ -0,0 +1,450 @@ +/* + * 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.interval; + +import org.apache.flink.api.common.functions.RuntimeContext; +import org.apache.flink.api.common.state.MapState; +import org.apache.flink.api.common.state.MapStateDescriptor; +import org.apache.flink.api.common.state.StateTtlConfig; +import org.apache.flink.api.common.typeinfo.Types; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.api.java.typeutils.MapTypeInfo; +import org.apache.flink.api.java.typeutils.TupleTypeInfo; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.streaming.api.functions.co.KeyedCoProcessFunction; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.runtime.generated.JoinCondition; +import org.apache.flink.table.runtime.typeutils.InternalTypeInfo; +import org.apache.flink.types.RowKind; +import org.apache.flink.util.Collector; + +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import static org.apache.flink.table.runtime.util.StateConfigUtil.createTtlConfig; + +/** + * A CoProcessFunction to execute time interval (time-bounded) stream semi/anti-join. Two kinds of + * time criteria: "L.time between R.time + X and R.time + Y" or "R.time between L.time - Y and + * L.time - X" X and Y might be negative or positive and X <= Y. + */ +public abstract class SemiAntiTimeIntervalJoin + extends KeyedCoProcessFunction<RowData, RowData, RowData, RowData> { + + protected static final String LEFT_RECORDS_STATE_NAME = "left-records"; + protected static final String RIGHT_RECORDS_STATE_NAME = "right-records"; + + private final boolean isAntiJoin; + + protected final long leftRelativeSize; + protected final long rightRelativeSize; + + protected final long allowedLateness; + private final InternalTypeInfo<RowData> leftType; + private final InternalTypeInfo<RowData> rightType; + private final IntervalJoinFunction joinFunction; + private final long stateRetentionTime; + + // state to store rows from the left stream + private transient SemiAntiLeftRecordStateView leftRecordStateView; + // state to store rows from the right stream + private transient SemiAntiRightRecordStateView rightRecordStateView; + + // Current time on the respective input stream. + protected long leftOperatorTime = 0L; + protected long rightOperatorTime = 0L; + + public SemiAntiTimeIntervalJoin( + boolean isAntiJoin, + long leftLowerBound, + long leftUpperBound, + long allowedLateness, + InternalTypeInfo<RowData> leftType, + InternalTypeInfo<RowData> rightType, + IntervalJoinFunction joinFunction, + long stateRetentionTime) { + this.isAntiJoin = isAntiJoin; + this.leftRelativeSize = -leftLowerBound; + this.rightRelativeSize = leftUpperBound; + if (allowedLateness < 0) { + throw new IllegalArgumentException("The allowed lateness must be non-negative."); + } + this.allowedLateness = allowedLateness; + this.leftType = leftType; + this.rightType = rightType; + this.joinFunction = joinFunction; + this.stateRetentionTime = stateRetentionTime; + } + + @Override + public void open(Configuration parameters) throws Exception { + super.open(parameters); + joinFunction.setRuntimeContext(getRuntimeContext()); + joinFunction.open(parameters); + + // TODO: support joins with unique keys + // now states only support no unique key + this.leftRecordStateView = + new SemiAntiLeftRecordStateView( + getRuntimeContext(), + LEFT_RECORDS_STATE_NAME, + leftType, + createTtlConfig(stateRetentionTime)); + + this.rightRecordStateView = + new SemiAntiRightRecordStateView( + getRuntimeContext(), + RIGHT_RECORDS_STATE_NAME, + rightType, + createTtlConfig(stateRetentionTime)); + } + + @Override + public void processElement1(RowData leftRow, Context ctx, Collector<RowData> out) + throws Exception { + updateOperatorTime(ctx); + + long timeForLeftRow = getTimeForLeftStream(ctx, leftRow); + long rightQualifiedLowerBound = timeForLeftRow - rightRelativeSize; + long rightQualifiedUpperBound = timeForLeftRow + leftRelativeSize; + + List<RowDataInfo> associatedRecords = + getRowDataAssociatedWithOtherInput( + leftRow, + true, + joinFunction.getJoinCondition(), + rightQualifiedLowerBound, + rightQualifiedUpperBound); + + if (associatedRecords.isEmpty()) { Review comment: So maybe it's better to also let semi join keep the same behavior with anti join that emit results when the expired time arrived instead of emitting result per record. Because I think when user use these two kinds of join, and find they have the different behaviors, he will be confused. What do you think? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
