| /* |
| * 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.transformation.dag.transformer.binary; |
| |
| import org.apache.iotdb.db.exception.query.QueryProcessException; |
| import org.apache.iotdb.db.queryengine.transformation.api.LayerPointReader; |
| import org.apache.iotdb.db.queryengine.transformation.api.YieldableState; |
| import org.apache.iotdb.db.queryengine.transformation.dag.transformer.Transformer; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| |
| import java.io.IOException; |
| |
| public abstract class BinaryTransformer extends Transformer { |
| |
| protected final LayerPointReader leftPointReader; |
| protected final LayerPointReader rightPointReader; |
| |
| protected final TSDataType leftPointReaderDataType; |
| protected final TSDataType rightPointReaderDataType; |
| |
| protected final boolean isLeftPointReaderConstant; |
| protected final boolean isRightPointReaderConstant; |
| |
| protected final boolean isCurrentConstant; |
| |
| protected BinaryTransformer(LayerPointReader leftPointReader, LayerPointReader rightPointReader) { |
| this.leftPointReader = leftPointReader; |
| this.rightPointReader = rightPointReader; |
| leftPointReaderDataType = leftPointReader.getDataType(); |
| rightPointReaderDataType = rightPointReader.getDataType(); |
| isLeftPointReaderConstant = leftPointReader.isConstantPointReader(); |
| isRightPointReaderConstant = rightPointReader.isConstantPointReader(); |
| isCurrentConstant = isLeftPointReaderConstant && isRightPointReaderConstant; |
| checkType(); |
| } |
| |
| protected abstract void checkType(); |
| |
| @Override |
| public boolean isConstantPointReader() { |
| return isCurrentConstant; |
| } |
| |
| @Override |
| public YieldableState yieldValue() throws Exception { |
| final YieldableState leftYieldableState = leftPointReader.yield(); |
| final YieldableState rightYieldableState = rightPointReader.yield(); |
| |
| if (YieldableState.NOT_YIELDABLE_NO_MORE_DATA.equals(leftYieldableState) |
| || YieldableState.NOT_YIELDABLE_NO_MORE_DATA.equals(rightYieldableState)) { |
| return YieldableState.NOT_YIELDABLE_NO_MORE_DATA; |
| } |
| |
| if (YieldableState.NOT_YIELDABLE_WAITING_FOR_DATA.equals(leftYieldableState) |
| || YieldableState.NOT_YIELDABLE_WAITING_FOR_DATA.equals(rightYieldableState)) { |
| return YieldableState.NOT_YIELDABLE_WAITING_FOR_DATA; |
| } |
| |
| final YieldableState timeYieldState = yieldTime(); |
| if (!YieldableState.YIELDABLE.equals(timeYieldState)) { |
| return timeYieldState; |
| } |
| |
| if (leftPointReader.isCurrentNull() || rightPointReader.isCurrentNull()) { |
| currentNull = true; |
| } else { |
| transformAndCache(); |
| } |
| |
| leftPointReader.readyForNext(); |
| rightPointReader.readyForNext(); |
| return YieldableState.YIELDABLE; |
| } |
| |
| private YieldableState yieldTime() throws Exception { |
| if (isCurrentConstant) { |
| return YieldableState.YIELDABLE; |
| } |
| if (isLeftPointReaderConstant) { |
| cachedTime = rightPointReader.currentTime(); |
| return YieldableState.YIELDABLE; |
| } |
| if (isRightPointReaderConstant) { |
| cachedTime = leftPointReader.currentTime(); |
| return YieldableState.YIELDABLE; |
| } |
| |
| long leftTime = leftPointReader.currentTime(); |
| long rightTime = rightPointReader.currentTime(); |
| |
| while (leftTime != rightTime) { |
| if (leftTime < rightTime) { |
| leftPointReader.readyForNext(); |
| final YieldableState leftYieldState = leftPointReader.yield(); |
| if (!YieldableState.YIELDABLE.equals(leftYieldState)) { |
| return leftYieldState; |
| } |
| leftTime = leftPointReader.currentTime(); |
| } else { |
| rightPointReader.readyForNext(); |
| final YieldableState rightYieldState = rightPointReader.yield(); |
| if (!YieldableState.YIELDABLE.equals(rightYieldState)) { |
| return rightYieldState; |
| } |
| rightTime = rightPointReader.currentTime(); |
| } |
| } |
| |
| // leftTime == rightTime |
| cachedTime = leftTime; |
| return YieldableState.YIELDABLE; |
| } |
| |
| @Override |
| protected boolean cacheValue() throws QueryProcessException, IOException { |
| if (!leftPointReader.next() || !rightPointReader.next()) { |
| return false; |
| } |
| |
| if (!cacheTime()) { |
| return false; |
| } |
| |
| if (leftPointReader.isCurrentNull() || rightPointReader.isCurrentNull()) { |
| currentNull = true; |
| } else { |
| transformAndCache(); |
| } |
| |
| leftPointReader.readyForNext(); |
| rightPointReader.readyForNext(); |
| return true; |
| } |
| |
| protected abstract void transformAndCache() throws QueryProcessException, IOException; |
| |
| /** |
| * finds the smallest, unconsumed timestamp that exists in both {@code leftPointReader} and {@code |
| * rightPointReader} and then caches the timestamp in {@code cachedTime}. |
| * |
| * @return true if there has a timestamp that meets the requirements |
| */ |
| private boolean cacheTime() throws IOException, QueryProcessException { |
| if (isCurrentConstant) { |
| return true; |
| } |
| if (isLeftPointReaderConstant) { |
| cachedTime = rightPointReader.currentTime(); |
| return true; |
| } |
| if (isRightPointReaderConstant) { |
| cachedTime = leftPointReader.currentTime(); |
| return true; |
| } |
| |
| long leftTime = leftPointReader.currentTime(); |
| long rightTime = rightPointReader.currentTime(); |
| |
| while (leftTime != rightTime) { |
| if (leftTime < rightTime) { |
| leftPointReader.readyForNext(); |
| if (!leftPointReader.next()) { |
| return false; |
| } |
| leftTime = leftPointReader.currentTime(); |
| } else { |
| rightPointReader.readyForNext(); |
| if (!rightPointReader.next()) { |
| return false; |
| } |
| rightTime = rightPointReader.currentTime(); |
| } |
| } |
| |
| // leftTime == rightTime |
| cachedTime = leftTime; |
| return true; |
| } |
| |
| protected static double castCurrentValueToDoubleOperand( |
| LayerPointReader layerPointReader, TSDataType layerPointReaderDataType) |
| throws IOException, QueryProcessException { |
| switch (layerPointReaderDataType) { |
| case INT32: |
| return layerPointReader.currentInt(); |
| case INT64: |
| return layerPointReader.currentLong(); |
| case FLOAT: |
| return layerPointReader.currentFloat(); |
| case DOUBLE: |
| return layerPointReader.currentDouble(); |
| case BOOLEAN: |
| return layerPointReader.currentBoolean() ? 1.0d : 0.0d; |
| default: |
| throw new QueryProcessException( |
| "Unsupported data type: " + layerPointReader.getDataType().toString()); |
| } |
| } |
| } |