org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe Maven / Gradle / Ivy
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* 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.hadoop.hive.serde2.columnar;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.serde2.ColumnProjectionUtils;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.SerDeParameters;
import org.apache.hadoop.hive.serde2.lazy.LazyUtils;
import org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryFactory;
import org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.StringObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.io.Writable;
/**
* LazyBinaryColumnarSerDe. This serde combines elements of columnar serde and lazybinary serde
* to produce a serde which serializes columns into a BytesRefArrayWritable in a compact binary
* format and which is deserialized in a lazy, i.e. on-demand fashion.
*
*/
public class LazyBinaryColumnarSerDe extends ColumnarSerDeBase {
private List columnNames;
private List columnTypes;
@Override
public String toString() {
return getClass().toString()
+ "["
+ columnNames
+ ":"
+ columnTypes + "]";
}
@Override
public void initialize(Configuration conf, Properties tbl) throws SerDeException {
SerDeParameters serdeParams = new SerDeParameters();
LazyUtils.extractColumnInfo(tbl, serdeParams, getClass().getName());
columnNames = serdeParams.getColumnNames();
columnTypes = serdeParams.getColumnTypes();
cachedObjectInspector = LazyBinaryFactory.createColumnarStructInspector(
columnNames, columnTypes);
int size = columnTypes.size();
List notSkipIDs = new ArrayList();
if (conf == null || ColumnProjectionUtils.isReadAllColumns(conf)) {
for (int i = 0; i < size; i++ ) {
notSkipIDs.add(i);
}
} else {
notSkipIDs = ColumnProjectionUtils.getReadColumnIDs(conf);
}
cachedLazyStruct = new LazyBinaryColumnarStruct(cachedObjectInspector, notSkipIDs);
super.initialize(size);
}
static final byte[] INVALID_UTF__SINGLE_BYTE = {(byte)Integer.parseInt("10111111", 2)};
@Override
public Writable serialize(Object obj, ObjectInspector objInspector) throws SerDeException {
if (objInspector.getCategory() != Category.STRUCT) {
throw new SerDeException(getClass().toString()
+ " can only serialize struct types, but we got: "
+ objInspector.getTypeName());
}
StructObjectInspector soi = (StructObjectInspector) objInspector;
List fields = soi.getAllStructFieldRefs();
List