Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/831#discussion_r118618438
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/pcap/PcapRecordReader.java
---
@@ -0,0 +1,295 @@
+/*
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.store.pcap;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.common.types.TypeProtos;
+import org.apache.drill.common.types.TypeProtos.MajorType;
+import org.apache.drill.common.types.TypeProtos.MinorType;
+import org.apache.drill.common.types.Types;
+import org.apache.drill.exec.exception.SchemaChangeException;
+import org.apache.drill.exec.expr.TypeHelper;
+import org.apache.drill.exec.ops.OperatorContext;
+import org.apache.drill.exec.physical.impl.OutputMutator;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.store.AbstractRecordReader;
+import org.apache.drill.exec.store.pcap.decoder.Packet;
+import org.apache.drill.exec.store.pcap.decoder.PacketDecoder;
+import org.apache.drill.exec.store.pcap.dto.ColumnDto;
+import org.apache.drill.exec.store.pcap.schema.PcapTypes;
+import org.apache.drill.exec.store.pcap.schema.Schema;
+import org.apache.drill.exec.vector.NullableBigIntVector;
+import org.apache.drill.exec.vector.NullableIntVector;
+import org.apache.drill.exec.vector.NullableTimeStampVector;
+import org.apache.drill.exec.vector.NullableVarCharVector;
+import org.apache.drill.exec.vector.ValueVector;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Map;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.apache.drill.exec.store.pcap.Utils.parseBytesToASCII;
+
+public class PcapRecordReader extends AbstractRecordReader {
+
+ private OutputMutator output;
+
+ private final PacketDecoder decoder;
+ private ImmutableList<ProjectedColumnInfo> projectedCols;
+
+ private byte[] buffer = new byte[100000];
+ private int offset = 0;
+ private InputStream in;
+ private int validBytes;
+
+ private static final Map<PcapTypes, MinorType> TYPES;
+
+ private static class ProjectedColumnInfo {
+ ValueVector vv;
+ ColumnDto pcapColumn;
+ }
+
+ static {
+ TYPES = ImmutableMap.<PcapTypes, TypeProtos.MinorType>builder()
+ .put(PcapTypes.STRING, MinorType.VARCHAR)
+ .put(PcapTypes.INTEGER, MinorType.INT)
+ .put(PcapTypes.LONG, MinorType.BIGINT)
+ .put(PcapTypes.TIMESTAMP, MinorType.TIMESTAMP)
+ .build();
+ }
+
+ public PcapRecordReader(final String inputPath,
+ final List<SchemaPath> projectedColumns) {
+ try {
+ this.in = new FileInputStream(inputPath);
+ this.decoder = getPacketDecoder();
+ validBytes = in.read(buffer);
+ } catch (IOException e) {
+ throw new RuntimeException("File " + inputPath + " not Found");
+ }
+ setColumns(projectedColumns);
+ }
+
+ @Override
+ public void setup(final OperatorContext context, final OutputMutator
output) throws ExecutionSetupException {
+ this.output = output;
+ }
+
+ @Override
+ public int next() {
+ projectedCols = getProjectedColsIfItNull();
+ try {
+ return parsePcapFilesAndPutItToTable();
+ } catch (IOException io) {
+ throw new RuntimeException("Trouble with reading packets in file!");
+ }
+ }
+
+ @Override
+ public void close() throws Exception {
+ }
+
+ private PacketDecoder getPacketDecoder() {
+ try {
+ return new PacketDecoder(in);
+ } catch (IOException io) {
+ throw new RuntimeException("File Not Found or some I/O issue");
+ }
+ }
+
+ private ImmutableList<ProjectedColumnInfo> getProjectedColsIfItNull() {
+ return projectedCols != null ? projectedCols : initCols(new Schema());
+ }
+
+ private ImmutableList<ProjectedColumnInfo> initCols(final Schema schema)
{
+ ImmutableList.Builder<ProjectedColumnInfo> pciBuilder =
ImmutableList.builder();
+ ColumnDto column;
+
+ for (int i = 0; i < schema.getNumberOfColumns(); i++) {
+ column = schema.getColumnByIndex(i);
+
+ final String name = column.getColumnName();
+ final PcapTypes type = column.getColumnType();
+ TypeProtos.MinorType minorType = TYPES.get(type);
+
+ ProjectedColumnInfo pci = getProjectedColumnInfo(column, name,
minorType);
+ pciBuilder.add(pci);
+ }
+ return pciBuilder.build();
+ }
+
+ private ProjectedColumnInfo getProjectedColumnInfo(final ColumnDto
column,
--- End diff --
This part of reading is a bit complex. Again, we are working in simplifying
it, but that work is not available yet.
You need to handle two cases:
```
SELECT * ...
SELECT `type`, `dst_ip`, ...
```
The first says to select all available columns, the other provides an
explicit list of columns to select. The code earlier said that this plugin
supports push-down, (that is, `supportsPushDown` returned true) so you've got
to handle projection for both cases.
The code handle the second type: a list of columns. It does not seem to
handle `SELECT *`, however.
I noticed, however, that the test case does include `SELECT *`. Maybe a
comment or two about how that case is handled?
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