org.apache.hive.service.cli.ColumnBasedSet Maven / Gradle / Ivy
/**
* 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.hive.service.cli;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.serde2.thrift.ColumnBuffer;
import org.apache.hadoop.hive.serde2.thrift.Type;
import org.apache.hive.service.rpc.thrift.TColumn;
import org.apache.hive.service.rpc.thrift.TRow;
import org.apache.hive.service.rpc.thrift.TRowSet;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TIOStreamTransport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ColumnBasedSet.
*/
public class ColumnBasedSet implements RowSet {
private long startOffset;
private final TypeDescriptor[] descriptors; // non-null only for writing (server-side)
private final List columns;
private byte[] blob;
private boolean isBlobBased = false;
public static final Logger LOG = LoggerFactory.getLogger(ColumnBasedSet.class);
public ColumnBasedSet(TableSchema schema) {
descriptors = schema.toTypeDescriptors();
columns = new ArrayList();
for (ColumnDescriptor colDesc : schema.getColumnDescriptors()) {
columns.add(new ColumnBuffer(colDesc.getType()));
}
}
public ColumnBasedSet(TRowSet tRowSet) throws TException {
descriptors = null;
columns = new ArrayList();
// Use TCompactProtocol to read serialized TColumns
if (tRowSet.isSetBinaryColumns()) {
TProtocol protocol =
new TCompactProtocol(new TIOStreamTransport(new ByteArrayInputStream(
tRowSet.getBinaryColumns())));
// Read from the stream using the protocol for each column in final schema
for (int i = 0; i < tRowSet.getColumnCount(); i++) {
TColumn tvalue = new TColumn();
try {
tvalue.read(protocol);
} catch (TException e) {
LOG.error(e.getMessage(), e);
throw new TException("Error reading column value from the row set blob", e);
}
columns.add(new ColumnBuffer(tvalue));
}
}
else {
if (tRowSet.getColumns() != null) {
for (TColumn tvalue : tRowSet.getColumns()) {
columns.add(new ColumnBuffer(tvalue));
}
}
}
startOffset = tRowSet.getStartRowOffset();
}
private ColumnBasedSet(TypeDescriptor[] descriptors, List columns, long startOffset) {
this.descriptors = descriptors;
this.columns = columns;
this.startOffset = startOffset;
}
public ColumnBasedSet(TableSchema schema, boolean isBlobBased) {
this(schema);
this.isBlobBased = isBlobBased;
}
@Override
public ColumnBasedSet addRow(Object[] fields) {
if (isBlobBased) {
this.blob = (byte[]) fields[0];
} else {
for (int i = 0; i < fields.length; i++) {
TypeDescriptor descriptor = descriptors[i];
Object field = fields[i];
if (field != null && descriptor.getType() == Type.DECIMAL_TYPE) {
int scale = descriptor.getDecimalDigits();
field = ((HiveDecimal) field).toFormatString(scale);
}
columns.get(i).addValue(descriptor.getType(), field);
}
}
return this;
}
public List getColumns() {
return columns;
}
@Override
public int numColumns() {
return columns.size();
}
@Override
public int numRows() {
return columns.isEmpty() ? 0 : columns.get(0).size();
}
@Override
public ColumnBasedSet extractSubset(int maxRows) {
int numRows = Math.min(numRows(), maxRows);
List subset = new ArrayList();
for (int i = 0; i < columns.size(); i++) {
subset.add(columns.get(i).extractSubset(numRows));
}
ColumnBasedSet result = new ColumnBasedSet(descriptors, subset, startOffset);
startOffset += numRows;
return result;
}
@Override
public long getStartOffset() {
return startOffset;
}
@Override
public void setStartOffset(long startOffset) {
this.startOffset = startOffset;
}
public TRowSet toTRowSet() {
TRowSet tRowSet = new TRowSet(startOffset, new ArrayList());
if (isBlobBased) {
tRowSet.setColumns(null);
tRowSet.setBinaryColumns(blob);
tRowSet.setColumnCount(numColumns());
} else {
for (int i = 0; i < columns.size(); i++) {
tRowSet.addToColumns(columns.get(i).toTColumn());
}
}
return tRowSet;
}
@Override
public Iterator iterator() {
return new Iterator() {
private int index;
private final Object[] convey = new Object[numColumns()];
@Override
public boolean hasNext() {
return index < numRows();
}
@Override
public Object[] next() {
for (int i = 0; i < columns.size(); i++) {
convey[i] = columns.get(i).get(index);
}
index++;
return convey;
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
};
}
public Object[] fill(int index, Object[] convey) {
for (int i = 0; i < columns.size(); i++) {
convey[i] = columns.get(i).get(index);
}
return convey;
}
}