| /* |
| * 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.multi; |
| |
| 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.udf.UDTFExecutor; |
| import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException; |
| |
| import java.io.IOException; |
| |
| public abstract class UniversalUDFQueryTransformer extends UDFQueryTransformer { |
| |
| protected final LayerPointReader layerPointReader; |
| protected final boolean isLayerPointReaderConstant; |
| |
| protected UniversalUDFQueryTransformer(UDTFExecutor executor) { |
| super(executor); |
| layerPointReader = executor.getCollector().constructPointReaderUsingTrivialEvictionStrategy(); |
| isLayerPointReaderConstant = layerPointReader.isConstantPointReader(); |
| } |
| |
| @Override |
| protected final YieldableState yieldValue() throws Exception { |
| while (!cacheValueFromUDFOutput()) { |
| final YieldableState udfYieldableState = tryExecuteUDFOnce(); |
| if (udfYieldableState == YieldableState.NOT_YIELDABLE_WAITING_FOR_DATA) { |
| return YieldableState.NOT_YIELDABLE_WAITING_FOR_DATA; |
| } |
| if (udfYieldableState == YieldableState.NOT_YIELDABLE_NO_MORE_DATA && !terminate()) { |
| return YieldableState.NOT_YIELDABLE_NO_MORE_DATA; |
| } |
| } |
| return YieldableState.YIELDABLE; |
| } |
| |
| @Override |
| protected final boolean cacheValue() throws QueryProcessException, IOException { |
| while (!cacheValueFromUDFOutput()) { |
| if (!executeUDFOnce() && !terminate()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| protected abstract YieldableState tryExecuteUDFOnce() throws Exception; |
| |
| protected abstract boolean executeUDFOnce() throws QueryProcessException, IOException; |
| |
| protected final boolean cacheValueFromUDFOutput() throws QueryProcessException, IOException { |
| if (!layerPointReader.next()) { |
| return false; |
| } |
| cachedTime = layerPointReader.currentTime(); |
| if (layerPointReader.isCurrentNull()) { |
| currentNull = true; |
| } else { |
| switch (tsDataType) { |
| case INT32: |
| cachedInt = layerPointReader.currentInt(); |
| break; |
| case INT64: |
| cachedLong = layerPointReader.currentLong(); |
| break; |
| case FLOAT: |
| cachedFloat = layerPointReader.currentFloat(); |
| break; |
| case DOUBLE: |
| cachedDouble = layerPointReader.currentDouble(); |
| break; |
| case BOOLEAN: |
| cachedBoolean = layerPointReader.currentBoolean(); |
| break; |
| case TEXT: |
| cachedBinary = layerPointReader.currentBinary(); |
| break; |
| default: |
| throw new UnSupportedDataTypeException(tsDataType.toString()); |
| } |
| } |
| layerPointReader.readyForNext(); |
| return true; |
| } |
| |
| @Override |
| public final boolean isConstantPointReader() { |
| return isLayerPointReaderConstant; |
| } |
| } |