Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18468#discussion_r128144719
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/CachedBatchColumnVector.java
---
@@ -0,0 +1,416 @@
+/*
+ * 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.spark.sql.execution.vectorized;
+
+import java.nio.ByteBuffer;
+
+import org.apache.spark.memory.MemoryMode;
+import org.apache.spark.sql.execution.columnar.*;
+import org.apache.spark.sql.types.*;
+import org.apache.spark.unsafe.types.UTF8String;
+
+/**
+ * A column backed by an in memory JVM array.
+ */
+public final class CachedBatchColumnVector extends ColumnVector {
+
+ // keep compressed data
+ private byte[] buffer;
+
+ // accessor for a column
+ private ColumnAccessor columnAccessor;
+
+ // a row where the compressed data is extracted
+ private ColumnVector columnVector;
+
+ // an accessor uses only row 0 in columnVector
+ private final int ROWID = 0;
+
+ // Keep row id that was previously accessed
+ private int previousRowId = -1;
+
+
+ public CachedBatchColumnVector(byte[] buffer, int numRows, DataType
type) {
+ super(numRows, DataTypes.NullType, MemoryMode.ON_HEAP);
+ initialize(buffer, type);
+ reserveInternal(numRows);
+ reset();
+ }
+
+ @Override
+ public long valuesNativeAddress() {
+ throw new RuntimeException("Cannot get native address for on heap
column");
+ }
+ @Override
+ public long nullsNativeAddress() {
+ throw new RuntimeException("Cannot get native address for on heap
column");
+ }
+
+ @Override
+ public void close() {
+ }
+
+ private void setColumnAccessor() {
+ ByteBuffer byteBuffer = ByteBuffer.wrap(buffer);
+ columnAccessor = ColumnAccessor$.MODULE$.apply(type, byteBuffer);
+ }
+
+ // call extractTo() before getting actual data
+ private void prepareAccess(int rowId) {
+ if (previousRowId + 1 == rowId) {
+ assert (columnAccessor.hasNext());
+ columnAccessor.extractTo(columnVector, ROWID);
+ previousRowId = rowId;
+ } else if (previousRowId != rowId) {
+ throw new UnsupportedOperationException("Row access order must be
sequentially ascending." +
+ " Internal row " + rowId + "is accessed after internal row "+
previousRowId + "was accessed.");
+ }
+ }
+
+ //
+ // APIs dealing with nulls
+ //
+
+ @Override
+ public void putNotNull(int rowId) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putNull(int rowId) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putNulls(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putNotNulls(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean isNullAt(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.isNullAt(ROWID);
+ }
+
+ //
+ // APIs dealing with Booleans
+ //
+
+ @Override
+ public void putBoolean(int rowId, boolean value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putBooleans(int rowId, int count, boolean value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean getBoolean(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getBoolean(ROWID);
+ }
+
+ @Override
+ public boolean[] getBooleans(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+
+ //
+ // APIs dealing with Bytes
+ //
+
+ @Override
+ public void putByte(int rowId, byte value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putBytes(int rowId, int count, byte value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putBytes(int rowId, int count, byte[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public byte getByte(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getByte(ROWID);
+ }
+
+ @Override
+ public byte[] getBytes(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with Shorts
+ //
+
+ @Override
+ public void putShort(int rowId, short value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putShorts(int rowId, int count, short value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putShorts(int rowId, int count, short[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public short getShort(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getShort(ROWID);
+ }
+
+ @Override
+ public short[] getShorts(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with Ints
+ //
+
+ @Override
+ public void putInt(int rowId, int value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putInts(int rowId, int count, int value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putInts(int rowId, int count, int[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putIntsLittleEndian(int rowId, int count, byte[] src, int
srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public int getInt(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getInt(ROWID);
+ }
+
+ @Override
+ public int[] getInts(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ /**
+ * Returns the dictionary Id for rowId.
+ * This should only be called when the ColumnVector is dictionaryIds.
+ * We have this separate method for dictionaryIds as per SPARK-16928.
+ */
+ public int getDictId(int rowId) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with Longs
+ //
+
+ @Override
+ public void putLong(int rowId, long value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putLongs(int rowId, int count, long value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putLongs(int rowId, int count, long[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putLongsLittleEndian(int rowId, int count, byte[] src, int
srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public long getLong(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getLong(ROWID);
+ }
+
+ @Override
+ public long[] getLongs(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with floats
+ //
+
+ @Override
+ public void putFloat(int rowId, float value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putFloats(int rowId, int count, float value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putFloats(int rowId, int count, float[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putFloats(int rowId, int count, byte[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public float getFloat(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getFloat(ROWID);
+ }
+
+ @Override
+ public float[] getFloats(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with doubles
+ //
+
+ @Override
+ public void putDouble(int rowId, double value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putDoubles(int rowId, int count, double value) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putDoubles(int rowId, int count, double[] src, int srcIndex)
{
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putDoubles(int rowId, int count, byte[] src, int srcIndex) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public double getDouble(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getDouble(ROWID);
+ }
+
+ @Override
+ public double[] getDoubles(int rowId, int count) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with Arrays
+ //
+
+ @Override
+ public int getArrayLength(int rowId) {
+ throw new UnsupportedOperationException();
+ }
+ @Override
+ public int getArrayOffset(int rowId) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void putArray(int rowId, int offset, int length) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void loadBytes(ColumnVector.Array array) {
+ throw new UnsupportedOperationException();
+ }
+
+ //
+ // APIs dealing with Byte Arrays
+ //
+
+ @Override
+ public int putByteArray(int rowId, byte[] value, int offset, int length)
{
+ throw new UnsupportedOperationException();
+ }
+
+ public final UTF8String getUTF8String(int rowId) {
+ prepareAccess(rowId);
+ return columnVector.getUTF8String(ROWID);
+ }
+
+ // Spilt this function out since it is the slow path.
+ @Override
+ protected void reserveInternal(int newCapacity) {
+ capacity = newCapacity;
+ }
+
+ private void initialize(byte[] buffer, DataType type) {
+ this.buffer = buffer;
+ this.type = type;
+
+ if (columnAccessor == null) {
+ setColumnAccessor();
--- End diff --
can we inline this method?
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