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https://issues.apache.org/jira/browse/DRILL-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16914401#comment-16914401
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ASF GitHub Bot commented on DRILL-7096:
---------------------------------------
vvysotskyi commented on pull request #1829: DRILL-7096: Develop vector for
canonical Map<K,V>
URL: https://github.com/apache/drill/pull/1829#discussion_r317193686
##########
File path:
exec/vector/src/main/java/org/apache/drill/exec/vector/complex/AbstractRepeatedMapVector.java
##########
@@ -0,0 +1,524 @@
+/*
+ * 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.vector.complex;
+
+import io.netty.buffer.DrillBuf;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.drill.common.types.TypeProtos;
+import org.apache.drill.common.types.Types;
+import org.apache.drill.exec.exception.OutOfMemoryException;
+import org.apache.drill.exec.expr.BasicTypeHelper;
+import org.apache.drill.exec.expr.holders.RepeatedValueHolder;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.memory.AllocationManager.BufferLedger;
+import org.apache.drill.exec.proto.UserBitShared.SerializedField;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.record.TransferPair;
+import org.apache.drill.exec.util.CallBack;
+import org.apache.drill.exec.vector.AddOrGetResult;
+import org.apache.drill.exec.vector.AllocationHelper;
+import org.apache.drill.exec.vector.SchemaChangeCallBack;
+import org.apache.drill.exec.vector.UInt4Vector;
+import org.apache.drill.exec.vector.ValueVector;
+import org.apache.drill.exec.vector.VectorDescriptor;
+
+public abstract class AbstractRepeatedMapVector extends AbstractMapVector
implements RepeatedValueVector {
+
+ protected final UInt4Vector offsets; // offsets to start of each record
(considering record indices are 0-indexed)
+ protected final EmptyValuePopulator emptyPopulator;
+
+ protected AbstractRepeatedMapVector(MaterializedField field, BufferAllocator
allocator, CallBack callBack) {
+ this(field, new UInt4Vector(BaseRepeatedValueVector.OFFSETS_FIELD,
allocator), callBack);
+ }
+
+ protected AbstractRepeatedMapVector(MaterializedField field, UInt4Vector
offsets, CallBack callBack) {
+ super(field, offsets.getAllocator(), callBack);
+ this.offsets = offsets;
+ this.emptyPopulator = new EmptyValuePopulator(offsets);
+ }
+
+ @Override
+ public UInt4Vector getOffsetVector() { return offsets; }
+
+ @Override
+ public ValueVector getDataVector() {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public <T extends ValueVector> AddOrGetResult<T>
addOrGetVector(VectorDescriptor descriptor) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void setInitialCapacity(int numRecords) {
+ offsets.setInitialCapacity(numRecords + 1);
+ for (final ValueVector v : this) {
+ v.setInitialCapacity(numRecords *
RepeatedValueVector.DEFAULT_REPEAT_PER_RECORD);
+ }
+ }
+
+ public void allocateNew(int groupCount, int innerValueCount) {
+ clear();
+ try {
+ allocateOffsetsNew(groupCount);
+ for (ValueVector v : getChildren()) {
+ AllocationHelper.allocatePrecomputedChildCount(v, groupCount, 50,
innerValueCount);
+ }
+ } catch (OutOfMemoryException e){
+ clear();
+ throw e;
+ }
+ reset();
+ }
+
+ abstract void reset();
+
+ public void allocateOffsetsNew(int groupCount) {
+ offsets.allocateNew(groupCount + 1);
+ offsets.zeroVector();
+ }
+
+ public Iterator<String> fieldNameIterator() {
+ return getChildFieldNames().iterator();
+ }
+
+ @Override
+ public List<ValueVector> getPrimitiveVectors() {
+ final List<ValueVector> primitiveVectors = super.getPrimitiveVectors();
+ primitiveVectors.add(offsets);
+ return primitiveVectors;
+ }
+
+ @Override
+ public int getBufferSize() {
+ if (getValueCount() == 0) {
+ return 0;
+ }
+ return offsets.getBufferSize() + super.getBufferSize();
+ }
+
+ @Override
+ public int getAllocatedSize() {
+ return offsets.getAllocatedSize() + super.getAllocatedSize();
+ }
+
+ @Override
+ public int getBufferSizeFor(final int valueCount) {
+ if (valueCount == 0) {
+ return 0;
+ }
+
+ long bufferSize = offsets.getBufferSizeFor(valueCount);
+ for (final ValueVector v : this) {
+ bufferSize += v.getBufferSizeFor(valueCount);
+ }
+
+ return (int) bufferSize;
+ }
+
+ @Override
+ public void close() {
+ offsets.close();
+ super.close();
+ }
+
+ public TransferPair getTransferPairToSingleMap(String reference,
BufferAllocator allocator) {
+ return new SingleMapTransferPair(this, reference, allocator);
+ }
+
+ @Override
+ public abstract TransferPair getTransferPair(BufferAllocator allocator);
+
+ @Override
+ public abstract TransferPair makeTransferPair(ValueVector to);
+
+ @Override
+ public abstract TransferPair getTransferPair(String ref, BufferAllocator
allocator);
+
+ @Override
+ public boolean allocateNewSafe() {
+ /* boolean to keep track if all the memory allocation were successful
+ * Used in the case of composite vectors when we need to allocate multiple
+ * buffers for multiple vectors. If one of the allocations failed we need
to
+ * clear all the memory that we allocated
+ */
+ boolean success = false;
+ try {
+ if (!offsets.allocateNewSafe()) {
+ return false;
+ }
+ success = super.allocateNewSafe();
+ } finally {
+ if (!success) {
+ clear();
+ }
+ }
+ offsets.zeroVector();
+ return success;
+ }
+
+ abstract class AbstractRepeatedMapTransferPair<T extends
AbstractRepeatedMapVector> implements TransferPair {
+
+ protected final T to;
+ protected final T from;
+ private final TransferPair[] pairs;
+
+ public AbstractRepeatedMapTransferPair(T to) {
+ this(to, true);
+ }
+
+ public AbstractRepeatedMapTransferPair(T to, boolean allocate) {
+ this.from = (T) AbstractRepeatedMapVector.this;
+ this.to = to;
+ this.pairs = new TransferPair[from.size()];
+ // todo: this.to.ephPair
Review comment:
Please either address this `TODO` or remove it.
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> Develop vector for canonical Map<K,V>
> -------------------------------------
>
> Key: DRILL-7096
> URL: https://issues.apache.org/jira/browse/DRILL-7096
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Igor Guzenko
> Assignee: Bohdan Kazydub
> Priority: Major
> Fix For: 1.17.0
>
>
> Canonical Map<K,V> datatype can be represented using combination of three
> value vectors:
> keysVector - vector for storing keys of each map
> valuesVector - vector for storing values of each map
> offsetsVector - vector for storing of start indexes of next each map
> So it's not very hard to create such Map vector, but there is a major issue
> with such map representation. It's hard to search maps values by key in such
> vector, need to investigate some advanced techniques to make such search
> efficient. Or find other more suitable options to represent map datatype in
> world of vectors.
> After question about maps, Apache Arrow developers responded that for Java
> they don't have real Map vector, for now they just have logical Map type
> definition where they define Map like: List< Struct<key:key_type,
> value:value_type> >. So implementation of value vector would be useful for
> Arrow too.
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