| /* |
| * 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.parquet.filter2.recordlevel; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.parquet.hadoop.metadata.ColumnPath; |
| import org.apache.parquet.filter2.recordlevel.IncrementallyUpdatedFilterPredicate.ValueInspector; |
| import org.apache.parquet.io.PrimitiveColumnIO; |
| import org.apache.parquet.io.api.Converter; |
| import org.apache.parquet.io.api.GroupConverter; |
| |
| import static org.apache.parquet.Preconditions.checkArgument; |
| import static org.apache.parquet.Preconditions.checkNotNull; |
| |
| /** |
| * See {@link FilteringRecordMaterializer} |
| */ |
| public class FilteringGroupConverter extends GroupConverter { |
| // the real converter |
| private final GroupConverter delegate; |
| |
| // the path, from the root of the schema, to this converter |
| // used ultimately by the primitive converter proxy to figure |
| // out which column it represents. |
| private final List<Integer> indexFieldPath; |
| |
| // for a given column, which nodes in the filter expression need |
| // to be notified of this column's value |
| private final Map<ColumnPath, List<ValueInspector>> valueInspectorsByColumn; |
| |
| // used to go from our indexFieldPath to the PrimitiveColumnIO for that column |
| private final Map<List<Integer>, PrimitiveColumnIO> columnIOsByIndexFieldPath; |
| |
| public FilteringGroupConverter( |
| GroupConverter delegate, |
| List<Integer> indexFieldPath, |
| Map<ColumnPath, List<ValueInspector>> valueInspectorsByColumn, Map<List<Integer>, |
| PrimitiveColumnIO> columnIOsByIndexFieldPath) { |
| |
| this.delegate = checkNotNull(delegate, "delegate"); |
| this.indexFieldPath = checkNotNull(indexFieldPath, "indexFieldPath"); |
| this.columnIOsByIndexFieldPath = checkNotNull(columnIOsByIndexFieldPath, "columnIOsByIndexFieldPath"); |
| this.valueInspectorsByColumn = checkNotNull(valueInspectorsByColumn, "valueInspectorsByColumn"); |
| } |
| |
| // When a converter is asked for, we get the real one from the delegate, then wrap it |
| // in a filtering pass-through proxy. |
| // TODO: making the assumption that getConverter(i) is only called once, is that valid? |
| @Override |
| public Converter getConverter(int fieldIndex) { |
| |
| // get the real converter from the delegate |
| Converter delegateConverter = checkNotNull(delegate.getConverter(fieldIndex), "delegate converter"); |
| |
| // determine the indexFieldPath for the converter proxy we're about to make, which is |
| // this converter's path + the requested fieldIndex |
| List<Integer> newIndexFieldPath = new ArrayList<Integer>(indexFieldPath.size() + 1); |
| newIndexFieldPath.addAll(indexFieldPath); |
| newIndexFieldPath.add(fieldIndex); |
| |
| if (delegateConverter.isPrimitive()) { |
| PrimitiveColumnIO columnIO = getColumnIO(newIndexFieldPath); |
| ColumnPath columnPath = ColumnPath.get(columnIO.getColumnDescriptor().getPath()); |
| ValueInspector[] valueInspectors = getValueInspectors(columnPath); |
| return new FilteringPrimitiveConverter(delegateConverter.asPrimitiveConverter(), valueInspectors); |
| } else { |
| return new FilteringGroupConverter(delegateConverter.asGroupConverter(), newIndexFieldPath, valueInspectorsByColumn, columnIOsByIndexFieldPath); |
| } |
| |
| } |
| |
| private PrimitiveColumnIO getColumnIO(List<Integer> indexFieldPath) { |
| PrimitiveColumnIO found = columnIOsByIndexFieldPath.get(indexFieldPath); |
| checkArgument(found != null, "Did not find PrimitiveColumnIO for index field path" + indexFieldPath); |
| return found; |
| } |
| |
| private ValueInspector[] getValueInspectors(ColumnPath columnPath) { |
| List<ValueInspector> inspectorsList = valueInspectorsByColumn.get(columnPath); |
| return inspectorsList == null ? new ValueInspector[0] |
| : inspectorsList.toArray(new ValueInspector[0]); |
| } |
| |
| @Override |
| public void start() { |
| delegate.start(); |
| } |
| |
| @Override |
| public void end() { |
| delegate.end(); |
| } |
| } |