somu-imply commented on code in PR #13268: URL: https://github.com/apache/druid/pull/13268#discussion_r1036262842
########## processing/src/main/java/org/apache/druid/segment/UnnestStorageAdapter.java: ########## @@ -0,0 +1,208 @@ +/* + * 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.druid.segment; + +import com.google.common.collect.Lists; +import org.apache.druid.java.util.common.granularity.Granularity; +import org.apache.druid.java.util.common.guava.Sequence; +import org.apache.druid.java.util.common.guava.Sequences; +import org.apache.druid.query.QueryMetrics; +import org.apache.druid.query.filter.Filter; +import org.apache.druid.query.filter.InDimFilter; +import org.apache.druid.segment.column.ColumnCapabilities; +import org.apache.druid.segment.data.Indexed; +import org.apache.druid.segment.data.ListIndexed; +import org.apache.druid.segment.filter.AndFilter; +import org.joda.time.DateTime; +import org.joda.time.Interval; + +import javax.annotation.Nullable; +import java.util.Arrays; +import java.util.LinkedHashSet; +import java.util.Objects; + +public class UnnestStorageAdapter implements StorageAdapter +{ + private final StorageAdapter baseAdapter; + private final String dimensionToUnnest; + private final String outputColumnName; + private final LinkedHashSet<String> allowSet; + + public UnnestStorageAdapter( + final StorageAdapter baseAdapter, + final String dimension, + final String outputColumnName, + final LinkedHashSet<String> allowSet + ) + { + this.baseAdapter = baseAdapter; + this.dimensionToUnnest = dimension; + this.outputColumnName = outputColumnName; + this.allowSet = allowSet; + } + + @Override + public Sequence<Cursor> makeCursors( + @Nullable Filter filter, + Interval interval, + VirtualColumns virtualColumns, + Granularity gran, + boolean descending, + @Nullable QueryMetrics<?> queryMetrics + ) + { + Filter updatedFilter; + if (allowSet != null && !allowSet.isEmpty()) { + final InDimFilter allowListFilters; + allowListFilters = new InDimFilter(dimensionToUnnest, allowSet); + if (filter != null) { + updatedFilter = new AndFilter(Arrays.asList(filter, allowListFilters)); + } else { + updatedFilter = allowListFilters; + } + } else { + updatedFilter = filter; + } + final Sequence<Cursor> baseCursorSequence = baseAdapter.makeCursors( + updatedFilter, + interval, + virtualColumns, + gran, + descending, + queryMetrics + ); + + return Sequences.map( + baseCursorSequence, + cursor -> { + Objects.requireNonNull(cursor); + Cursor retVal = cursor; + ColumnCapabilities capabilities = cursor.getColumnSelectorFactory().getColumnCapabilities(dimensionToUnnest); + if (capabilities.isDictionaryEncoded() == ColumnCapabilities.Capable.TRUE + && capabilities.areDictionaryValuesUnique() == ColumnCapabilities.Capable.TRUE) { + retVal = new DimensionUnnestCursor(retVal, retVal.getColumnSelectorFactory(), dimensionToUnnest, outputColumnName, allowSet); + } else { + retVal = new ColumnarValueUnnestCursor(retVal, retVal.getColumnSelectorFactory(), dimensionToUnnest, outputColumnName, allowSet); + } + return retVal; + } + ); + } + + @Override + public Interval getInterval() + { + return baseAdapter.getInterval(); + } + + @Override + public Indexed<String> getAvailableDimensions() + { + final LinkedHashSet<String> availableDimensions = new LinkedHashSet<>(); + + for (String dim : baseAdapter.getAvailableDimensions()) { + availableDimensions.add(dim); + } + availableDimensions.add(outputColumnName); + return new ListIndexed<>(Lists.newArrayList(availableDimensions)); + } + + @Override + public Iterable<String> getAvailableMetrics() + { + return baseAdapter.getAvailableMetrics(); + } + + @Override + public int getDimensionCardinality(String column) + { + if (outputColumnName.equals(dimensionToUnnest)) { + return baseAdapter.getDimensionCardinality(column); + } + return baseAdapter.getDimensionCardinality(dimensionToUnnest); + } + + @Override + public DateTime getMinTime() + { + return baseAdapter.getMinTime(); + } + + @Override + public DateTime getMaxTime() + { + return baseAdapter.getMaxTime(); + } + + @Nullable + @Override + public Comparable getMinValue(String column) + { + if (outputColumnName.equals(dimensionToUnnest)) { + return baseAdapter.getMinValue(column); + } + return baseAdapter.getMinValue(dimensionToUnnest); + } + + @Nullable + @Override + public Comparable getMaxValue(String column) + { + if (outputColumnName.equals(dimensionToUnnest)) { + return baseAdapter.getMaxValue(column); + } + return baseAdapter.getMaxValue(dimensionToUnnest); + } + + @Nullable + @Override + public ColumnCapabilities getColumnCapabilities(String column) + { + if (outputColumnName.equals(dimensionToUnnest)) { + return baseAdapter.getColumnCapabilities(column); Review Comment: This part delegates the column capabilities to the ones of the base adapter so the properties depends on the column capabilities of the input column. I am not sure I understood this correctly though -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
