| /* |
| * 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.drill.exec.physical.impl.materialize; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.drill.exec.ops.OperatorStats; |
| import org.apache.drill.exec.physical.impl.ScreenCreator.ScreenRoot.Metric; |
| import org.apache.drill.exec.proto.UserBitShared.QueryData; |
| import org.apache.drill.exec.proto.UserBitShared.QueryId; |
| import org.apache.drill.exec.proto.UserBitShared.RecordBatchDef; |
| import org.apache.drill.exec.proto.UserBitShared.SerializedField; |
| import org.apache.drill.exec.record.VectorContainer; |
| import org.apache.drill.exec.record.VectorWrapper; |
| |
| /** |
| * Packages a batch from the Screen operator to send to its |
| * user connection. In the original Drill, that connection was always a |
| * network connection, and so the outgoing batch is serialized to a set |
| * of buffers ready to send. However, the REST server runs in the same process. |
| * The original REST query implementation serialized the data to buffers, then |
| * copied the data to a big buffer to be deserialized, causing significant memory |
| * pressure. This version allows the user connection to elect for serialization, |
| * or just to access the original source batch. |
| */ |
| public interface QueryDataPackage { |
| |
| QueryId queryId(); |
| QueryWritableBatch toWritableBatch(); |
| VectorContainer batch(); |
| List<SerializedField> fields(); |
| |
| /** |
| * Package that contains only a query ID. Send for a query that |
| * finishes with no data. The results are null: no data, no schema. |
| */ |
| public static class EmptyResultsPackage implements QueryDataPackage { |
| |
| private final QueryId queryId; |
| |
| public EmptyResultsPackage(QueryId queryId) { |
| this.queryId = queryId; |
| } |
| |
| @Override |
| public QueryId queryId() { return queryId; } |
| |
| /** |
| * Creates a message that sends only the query ID to the |
| * client. |
| */ |
| @Override |
| public QueryWritableBatch toWritableBatch() { |
| QueryData header = QueryData.newBuilder() |
| .setQueryId(queryId) |
| .setRowCount(0) |
| .setDef(RecordBatchDef.getDefaultInstance()) |
| .build(); |
| return new QueryWritableBatch(header); |
| } |
| |
| @Override |
| public VectorContainer batch() { return null; } |
| |
| @Override |
| public List<SerializedField> fields() { |
| return Collections.emptyList(); |
| } |
| } |
| |
| /** |
| * Represents a batch of data with a schema. |
| */ |
| public static class DataPackage implements QueryDataPackage { |
| private final RecordMaterializer materializer; |
| private final OperatorStats stats; |
| |
| public DataPackage(RecordMaterializer materializer, OperatorStats stats) { |
| this.materializer = materializer; |
| this.stats = stats; |
| } |
| |
| @Override |
| public QueryId queryId() { return materializer.queryId(); } |
| |
| @Override |
| public QueryWritableBatch toWritableBatch() { |
| QueryWritableBatch batch = materializer.convertNext(); |
| stats.addLongStat(Metric.BYTES_SENT, batch.getByteCount()); |
| return batch; |
| } |
| |
| @Override |
| public VectorContainer batch() { |
| return materializer.incoming(); |
| } |
| |
| @Override |
| public List<SerializedField> fields() { |
| List<SerializedField> metadata = new ArrayList<>(); |
| for (VectorWrapper<?> vw : batch()) { |
| metadata.add(vw.getValueVector().getMetadata()); |
| } |
| return metadata; |
| } |
| } |
| } |