somu-imply commented on code in PR #15470: URL: https://github.com/apache/druid/pull/15470#discussion_r1426088362
########## extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/WindowOperatorQueryFrameProcessor.java: ########## @@ -0,0 +1,222 @@ +/* + * 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.msq.querykit; + +import com.fasterxml.jackson.databind.ObjectMapper; +import com.google.common.collect.Iterables; +import org.apache.druid.collections.ResourceHolder; +import org.apache.druid.frame.Frame; +import org.apache.druid.frame.channel.FrameWithPartition; +import org.apache.druid.frame.channel.ReadableFrameChannel; +import org.apache.druid.frame.channel.WritableFrameChannel; +import org.apache.druid.frame.processor.ReturnOrAwait; +import org.apache.druid.frame.read.FrameReader; +import org.apache.druid.frame.util.SettableLongVirtualColumn; +import org.apache.druid.frame.write.FrameWriter; +import org.apache.druid.frame.write.FrameWriterFactory; +import org.apache.druid.java.util.common.Pair; +import org.apache.druid.java.util.common.Unit; +import org.apache.druid.java.util.common.io.Closer; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.msq.input.ReadableInput; +import org.apache.druid.msq.input.table.SegmentWithDescriptor; +import org.apache.druid.msq.querykit.scan.ScanQueryFrameProcessor; +import org.apache.druid.query.operator.OffsetLimit; +import org.apache.druid.query.operator.Operator; +import org.apache.druid.query.operator.OperatorFactory; +import org.apache.druid.query.operator.WindowOperatorQuery; +import org.apache.druid.query.rowsandcols.LazilyDecoratedRowsAndColumns; +import org.apache.druid.query.rowsandcols.RowsAndColumns; +import org.apache.druid.query.rowsandcols.concrete.RowBasedFrameRowAndColumns; +import org.apache.druid.segment.Cursor; +import org.apache.druid.segment.Segment; +import org.apache.druid.segment.SegmentReference; +import org.apache.druid.segment.SimpleAscendingOffset; +import org.apache.druid.segment.SimpleSettableOffset; +import org.apache.druid.segment.VirtualColumn; +import org.apache.druid.segment.VirtualColumns; +import org.apache.druid.segment.column.RowSignature; + +import javax.annotation.Nullable; +import java.io.Closeable; +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; +import java.util.function.Function; + +public class WindowOperatorQueryFrameProcessor extends BaseLeafFrameProcessor +{ + + private static final Logger log = new Logger(ScanQueryFrameProcessor.class); + private final WindowOperatorQuery query; + private final ObjectMapper jsonMapper; + private final SettableLongVirtualColumn partitionBoostVirtualColumn; + private final VirtualColumns frameWriterVirtualColumns; + private final Closer closer = Closer.create(); + + private Cursor cursor; + private Segment segment; + private final SimpleSettableOffset cursorOffset = new SimpleAscendingOffset(Integer.MAX_VALUE); + private FrameWriter frameWriter; + private long currentAllocatorCapacity; // Used for generating FrameRowTooLargeException if needed + + public WindowOperatorQueryFrameProcessor( + final WindowOperatorQuery query, + final ObjectMapper jsonMapper, + final ReadableInput baseInput, + final Function<SegmentReference, SegmentReference> segmentMapFn, + final ResourceHolder<WritableFrameChannel> outputChannelHolder, + final ResourceHolder<FrameWriterFactory> frameWriterFactoryHolder + ) + { + super( + baseInput, + segmentMapFn, + outputChannelHolder, + frameWriterFactoryHolder + ); + this.query = query; + this.jsonMapper = jsonMapper; + this.partitionBoostVirtualColumn = new SettableLongVirtualColumn(QueryKitUtils.PARTITION_BOOST_COLUMN); + + final List<VirtualColumn> frameWriterVirtualColumns = new ArrayList<>(); + frameWriterVirtualColumns.add(partitionBoostVirtualColumn); + + final VirtualColumn segmentGranularityVirtualColumn = + QueryKitUtils.makeSegmentGranularityVirtualColumn(jsonMapper, query); + + if (segmentGranularityVirtualColumn != null) { + frameWriterVirtualColumns.add(segmentGranularityVirtualColumn); + } + + this.frameWriterVirtualColumns = VirtualColumns.create(frameWriterVirtualColumns); + } + + // deep storage + @Override + protected ReturnOrAwait<Unit> runWithSegment(SegmentWithDescriptor segment) throws IOException + { + return null; + } + + // realtime + @Override + protected ReturnOrAwait<Unit> runWithLoadedSegment(SegmentWithDescriptor segment) throws IOException + { + return null; + } + + // previous stage output + @Override + protected ReturnOrAwait<Unit> runWithInputChannel(ReadableFrameChannel inputChannel, FrameReader inputFrameReader) + throws IOException + { + // Read the frames from the channel + // convert to FrameRowsAndColumns + + if (inputChannel.canRead()) { + Frame f = inputChannel.read(); + + // the frame here is row based + // frame rows and columns need columnar. discuss with Eric + // Action item: need to implement a new rows and columns that accept a row-based frame + + // Create a frame rows and columns what would + RowBasedFrameRowAndColumns frameRowsAndColumns = new RowBasedFrameRowAndColumns(f, inputFrameReader.signature()); + Operator op = getOperator(frameRowsAndColumns); + // + //Operator op = new SegmentToRowsAndColumnsOperator(frameSegment); + // On the operator created above add the operators present in the query that we want to chain + + for (OperatorFactory of : query.getOperators()) { + op = of.wrap(op); + } + + // Let the operator run + // the results that come in the receiver must be pushed to the outout channel + // need to transform the output rows and columns back to frame + Operator.go(op, new Operator.Receiver() + { + @Override + public Operator.Signal push(RowsAndColumns rac) + { + //outputFrameChannel.output(rac.toFrame()); + LazilyDecoratedRowsAndColumns tmpldrc = new LazilyDecoratedRowsAndColumns( + rac, + null, + null, + null, + OffsetLimit.limit(Integer.MAX_VALUE), + null, + null + ); + Pair<byte[], RowSignature> pairFrames = tmpldrc.naiveMaterializeToRowFrames(rac); + Frame f = Frame.wrap(pairFrames.lhs); + try { + Iterables.getOnlyElement(outputChannels()) + .write(new FrameWithPartition(f, FrameWithPartition.NO_PARTITION)); + } + catch (IOException e) { + throw new RuntimeException(e); + } + return Operator.Signal.GO; + } + + @Override + public void completed() + { + + } + }); + + } else if (inputChannel.isFinished()) { + return ReturnOrAwait.returnObject(Unit.instance()); + } else { + return ReturnOrAwait.awaitAll(inputChannels().size()); + } + return ReturnOrAwait.runAgain(); + } + + private static Operator getOperator(RowBasedFrameRowAndColumns frameRowsAndColumns) + { + LazilyDecoratedRowsAndColumns ldrc = new LazilyDecoratedRowsAndColumns( + frameRowsAndColumns, + null, + null, + null, + OffsetLimit.limit(Integer.MAX_VALUE), + null, + null + ); + // Create an operator on top of the created rows and columns + Operator op = new Operator() + { + @Nullable + @Override + public Closeable goOrContinue(Closeable continuationObject, Receiver receiver) + { + receiver.push(ldrc); + receiver.completed(); + return continuationObject; Review Comment: After completed I should return null here -- This is an automated message from the Apache Git Service. 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