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org.apache.hadoop.hive.ql.exec.persistence.FlatRowContainer 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.hadoop.hive.ql.exec.persistence;
import java.io.ObjectOutputStream;
import java.util.AbstractCollection;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.SerDe;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.io.ShortWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.ObjectInspectorCopyOption;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Writable;
@SuppressWarnings("deprecation")
public class FlatRowContainer extends AbstractCollection
implements MapJoinRowContainer, AbstractRowContainer.RowIterator>, List {
private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
private static final int UNKNOWN = Integer.MAX_VALUE;
private static Log LOG = LogFactory.getLog(FlatRowContainer.class);
/**
* In lazy mode, 0s element contains context for deserialization and all the other
* elements contains byte arrays to be deserialized. After deserialization, the array
* contains row count * row size elements - a matrix of rows stored.
*/
private Object[] array;
/**
* This is kind of tricky. UNKNOWN number means unknown. Other positive numbers represent
* row length (see array javadoc). Non-positive numbers mean row length is zero (thus,
* array is empty); they represent (negated) number of rows (for joins w/o projections).
*/
private int rowLength = UNKNOWN;
private byte aliasFilter = (byte) 0xff;
private boolean isAliasFilterSet = true; // by default assume no filter tag so we are good
public FlatRowContainer() {
this.array = EMPTY_OBJECT_ARRAY;
}
/** Called when loading the hashtable. */
public void add(MapJoinObjectSerDeContext context,
BytesWritable value) throws HiveException {
SerDe serde = context.getSerDe();
isAliasFilterSet = !context.hasFilterTag(); // has tag => need to set later
if (rowLength == UNKNOWN) {
try {
rowLength = ObjectInspectorUtils.getStructSize(serde.getObjectInspector());
} catch (SerDeException ex) {
throw new HiveException("Get structure size error", ex);
}
if (rowLength == 0) {
array = EMPTY_OBJECT_ARRAY;
}
}
if (rowLength > 0) {
int rowCount = (array.length / rowLength);
listRealloc(array.length + rowLength);
read(serde, value, rowCount);
} else {
--rowLength; // see rowLength javadoc
}
}
// Implementation of AbstractRowContainer and assorted methods
@Override
public void addRow(List t) throws HiveException {
LOG.debug("Add is called with " + t.size() + " objects");
// This is not called when building HashTable; we don't expect it to be called ever.
int offset = prepareForAdd(t.size());
if (offset < 0) return;
for (int i = 0; i < t.size(); ++i) {
this.array[offset + i] = t.get(i);
}
}
@Override
public void addRow(Object[] value) throws HiveException {
LOG.debug("Add is called with " + value.length + " objects");
// This is not called when building HashTable; we don't expect it to be called ever.
int offset = prepareForAdd(value.length);
if (offset < 0) return;
System.arraycopy(value, 0, this.array, offset, value.length);
}
private int prepareForAdd(int len) throws HiveException {
if (rowLength < 0) {
if (len != 0) {
throw new HiveException("Different size rows: 0 and " + len);
}
--rowLength; // see rowLength javadoc
return -1;
}
if (rowLength != len) {
throw new HiveException("Different size rows: " + rowLength + " and " + len);
}
int oldLen = this.array.length;
listRealloc(oldLen + len);
return oldLen;
}
@Override
public void write(MapJoinObjectSerDeContext valueContext, ObjectOutputStream out) {
throw new UnsupportedOperationException(this.getClass().getName() + " cannot be serialized");
}
@Override
public AbstractRowContainer.RowIterator> rowIter() throws HiveException {
if (array.length == rowLength) {
// optimize for common case - just one row for a key, container acts as iterator
return this;
}
return rowLength > 0 ? new RowIterator() : new EmptyRowIterator(-rowLength);
}
@Override
public List first() throws HiveException {
if (array.length != rowLength) {
throw new AssertionError("Incorrect iterator usage, not single-row");
}
return this; // optimize for common case - just one row for a key, container acts as row
}
@Override
public List next() {
return null; // single-row case, there's no next
}
/** Iterator for row length 0. */
private static class EmptyRowIterator implements AbstractRowContainer.RowIterator> {
private static final List EMPTY_ROW = new ArrayList();
private int rowCount;
public EmptyRowIterator(int rowCount) {
this.rowCount = rowCount;
}
@Override
public List first() throws HiveException {
return next();
}
@Override
public List next() throws HiveException {
return (--rowCount < 0) ? null : EMPTY_ROW;
}
}
/** Row iterator for non-zero-length rows. */
private class RowIterator implements AbstractRowContainer.RowIterator> {
private int index = 0;
@Override
public List first() throws HiveException {
index = 0;
if (array.length > 0) {
return new ReadOnlySubList(0, rowLength);
}
return null;
}
@Override
public List next() {
index += rowLength;
if (index < array.length) {
return new ReadOnlySubList(index, rowLength);
}
return null;
}
}
private void read(SerDe serde, Writable writable, int rowOffset) throws HiveException {
try {
ObjectInspectorUtils.copyStructToArray(
serde.deserialize(writable), serde.getObjectInspector(),
ObjectInspectorCopyOption.WRITABLE, this.array, rowOffset * rowLength);
} catch (SerDeException ex) {
throw new HiveException("Lazy deserialize error", ex);
}
}
@Override
public boolean hasRows() throws HiveException {
return rowCount() > 0;
}
@Override
public boolean isSingleRow() throws HiveException {
return rowCount() == 1;
}
@Override
public int rowCount() throws HiveException {
return rowLength > 0 ? (array.length / rowLength) : -rowLength; // see rowLength javadoc
}
@Override
public void clearRows() {
array = EMPTY_OBJECT_ARRAY;
rowLength = 0;
}
@Override
public byte getAliasFilter() throws HiveException {
ensureAliasFilter();
return this.aliasFilter;
}
private void ensureAliasFilter() throws HiveException {
if (!isAliasFilterSet && rowLength > 0) {
for (int offset = rowLength - 1; offset < array.length; offset += rowLength) {
aliasFilter &= ((ShortWritable)array[offset]).get();
}
}
isAliasFilterSet = true;
}
@Override
public MapJoinRowContainer copy() throws HiveException {
FlatRowContainer result = new FlatRowContainer();
result.array = new Object[this.array.length];
System.arraycopy(this.array, 0, result.array, 0, this.array.length);
result.rowLength = rowLength;
result.aliasFilter = aliasFilter;
return result;
}
// Implementation of List and assorted methods
private void listRealloc(int length) {
Object[] array = new Object[length];
if (this.array.length > 0) {
System.arraycopy(this.array, 0, array, 0, this.array.length);
}
this.array = array;
}
@Override
public int size() {
checkSingleRow();
return array.length;
}
@Override
public Object get(int index) {
return array[index];
}
private class ReadOnlySubList extends AbstractList {
private int offset;
private int size;
ReadOnlySubList(int from, int size) {
this.offset = from;
this.size = size;
}
public Object get(int index) {
return array[index + offset];
}
public int size() {
return size;
}
public Iterator iterator() {
return listIterator();
}
public ListIterator listIterator(int index) {
return listIteratorInternal(offset + index, offset, offset + size);
}
public List subList(int fromIndex, int toIndex) {
return new ReadOnlySubList(offset + fromIndex, toIndex - fromIndex);
}
public Object[] toArray() {
Object[] result = new Object[size];
System.arraycopy(array, offset, result, 0, size);
return result;
}
} // end ReadOnlySubList
@Override
public Object[] toArray() {
checkSingleRow();
return array;
}
@Override
public Iterator iterator() {
return listIterator();
}
@Override
public ListIterator listIterator() {
return listIterator(0);
}
@Override
public ListIterator listIterator(final int index) {
checkSingleRow();
return listIteratorInternal(index, 0, array.length);
}
private ListIterator listIteratorInternal(
final int index, final int iterMinPos, final int iterMaxPos) {
return new ListIterator() {
private int pos = index - 1;
public int nextIndex() {
return pos + 1;
}
public int previousIndex() {
return pos - 1;
}
public boolean hasNext() {
return nextIndex() < iterMaxPos;
}
public boolean hasPrevious() {
return previousIndex() >= iterMinPos;
}
public Object next() {
if (!hasNext()) throw new NoSuchElementException();
return get(++pos);
}
public Object previous() {
if (!hasPrevious()) throw new NoSuchElementException();
return get(--pos);
}
public void remove() { throw new UnsupportedOperationException(); }
public void set(Object e) { throw new UnsupportedOperationException(); }
public void add(Object e) { throw new UnsupportedOperationException(); }
}; // end ListIterator
}
@Override
public int indexOf(Object o) {
checkSingleRow();
for (int i = 0; i < array.length; ++i) {
if (o == null) {
if (array[i] == null) return i;
} else {
if (o.equals(array[i])) return i;
}
}
return -1;
}
private void checkSingleRow() throws AssertionError {
if (array.length != rowLength) {
throw new AssertionError("Incorrect list usage, not single-row");
}
}
@Override
public int lastIndexOf(Object o) {
checkSingleRow();
for (int i = array.length - 1; i >= 0; --i) {
if (o == null) {
if (array[i] == null) return i;
} else {
if (o.equals(array[i])) return i;
}
}
return -1;
}
@Override
public List subList(int fromIndex, int toIndex) {
checkSingleRow();
return new ReadOnlySubList(fromIndex, toIndex - fromIndex);
}
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException();
}
public Object set(int index, Object element) { throw new UnsupportedOperationException(); }
public void add(int index, Object element) { throw new UnsupportedOperationException(); }
public Object remove(int index) { throw new UnsupportedOperationException(); }
}
