JackieTien97 commented on code in PR #14791: URL: https://github.com/apache/iotdb/pull/14791#discussion_r1986751108
########## iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/process/function/PartitionRecognizer.java: ########## @@ -0,0 +1,187 @@ +/* + * 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.iotdb.db.queryengine.execution.operator.process.function; + +import org.apache.iotdb.commons.udf.utils.UDFDataTypeTransformer; +import org.apache.iotdb.db.queryengine.execution.operator.process.function.partition.PartitionState; +import org.apache.iotdb.db.queryengine.execution.operator.process.function.partition.Slice; +import org.apache.iotdb.udf.api.type.Type; + +import org.apache.tsfile.enums.TSDataType; +import org.apache.tsfile.read.common.block.TsBlock; + +import java.util.ArrayList; +import java.util.List; +import java.util.Objects; + +public class PartitionRecognizer { + + private final List<Integer> partitionChannels; + private final List<Object> partitionValues; + private final List<Integer> requiredChannels; + private final List<Integer> passThroughChannels; + private final List<Type> inputDataTypes; + private TsBlock currentTsBlock = null; + private boolean noMoreData = false; + private int currentIndex = 0; + private PartitionState state = PartitionState.INIT_STATE; + + public PartitionRecognizer( + List<Integer> partitionChannels, + List<Integer> requiredChannels, + List<Integer> passThroughChannels, + List<TSDataType> inputDataTypes) { + this.partitionChannels = partitionChannels; + this.partitionValues = new ArrayList<>(partitionChannels.size()); + for (int i = 0; i < partitionChannels.size(); i++) { + partitionValues.add(null); + } + this.requiredChannels = requiredChannels; + this.passThroughChannels = passThroughChannels; + this.inputDataTypes = UDFDataTypeTransformer.transformToUDFDataTypeList(inputDataTypes); + } + + // TsBlock is sorted by partition columns already + public void addTsBlock(TsBlock tsBlock) { + if (noMoreData) { + throw new IllegalArgumentException( + "The partition handler is finished, cannot add more data."); + } + currentTsBlock = tsBlock; + } + + /** Marks the handler as finished. */ + public void noMoreData() { + noMoreData = true; + } + + public PartitionState nextState() { + updateState(); + return state; + } + + private void updateState() { + switch (state.getStateType()) { + case INIT: + state = handleInitState(); + break; + case NEW_PARTITION: + state = handleNewPartitionState(); + break; + case ITERATING: + state = handleIteratingState(); + break; + case NEED_MORE_DATA: + state = handleNeedMoreDataState(); + break; + case FINISHED: + // do nothing + return; + } + if (PartitionState.NEED_MORE_DATA_STATE.equals(state)) { + currentIndex = 0; + } + } + + private PartitionState handleInitState() { + if (currentTsBlock == null || currentTsBlock.isEmpty()) { + return PartitionState.INIT_STATE; + } + int endPartitionIndex = findNextDifferentRowIndex(); + Slice slice = getSlice(currentIndex, endPartitionIndex); + currentIndex = endPartitionIndex; + return PartitionState.newPartitionState(slice); + } + + private PartitionState handleNewPartitionState() { + if (currentIndex >= currentTsBlock.getPositionCount()) { + return PartitionState.NEED_MORE_DATA_STATE; + } else { + int endPartitionIndex = findNextDifferentRowIndex(); + Slice slice = getSlice(currentIndex, endPartitionIndex); + currentIndex = endPartitionIndex; + return PartitionState.newPartitionState(slice); + } + } + + private PartitionState handleNeedMoreDataState() { + if (noMoreData) { + return PartitionState.FINISHED_STATE; + } else if (currentTsBlock == null || currentTsBlock.isEmpty()) { + return PartitionState.NEED_MORE_DATA_STATE; + } + int endPartitionIndex = findNextDifferentRowIndex(); + if (endPartitionIndex != 0) { + Slice slice = getSlice(currentIndex, endPartitionIndex); + currentIndex = endPartitionIndex; + return PartitionState.iteratingState(slice); + } else { + currentIndex = endPartitionIndex; + endPartitionIndex = findNextDifferentRowIndex(); + Slice slice = getSlice(currentIndex, endPartitionIndex); + currentIndex = endPartitionIndex; + return PartitionState.newPartitionState(slice); + } + } + + private PartitionState handleIteratingState() { + if (currentIndex >= currentTsBlock.getPositionCount()) { + return PartitionState.NEED_MORE_DATA_STATE; + } else { + int endPartitionIndex = findNextDifferentRowIndex(); + Slice slice = getSlice(currentIndex, endPartitionIndex); + currentIndex = endPartitionIndex; + return PartitionState.newPartitionState(slice); Review Comment: what if endPartitionIndex == endPostion? -- This is an automated message from the Apache Git Service. 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