Github user ravipesala commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1000#discussion_r121934452
--- Diff:
core/src/main/java/org/apache/carbondata/core/datastore/page/UnsafeVarLengthColumnPage.java
---
@@ -0,0 +1,150 @@
+/*
+ * 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.carbondata.core.datastore.page;
+
+import java.math.BigDecimal;
+
+import org.apache.carbondata.core.memory.CarbonUnsafe;
+import org.apache.carbondata.core.memory.MemoryBlock;
+import org.apache.carbondata.core.memory.MemoryException;
+import org.apache.carbondata.core.memory.UnsafeMemoryManager;
+import org.apache.carbondata.core.metadata.datatype.DataType;
+import org.apache.carbondata.core.util.DataTypeUtil;
+
+// This extension uses unsafe memory to store page data, for variable
length data type (string,
+// decimal)
+public class UnsafeVarLengthColumnPage extends VarLengthColumnPageBase {
+
+ // memory allocated by Unsafe
+ private MemoryBlock memoryBlock;
+
+ // base address of memoryBlock
+ private Object baseAddress;
+
+ // base offset of memoryBlock
+ private long baseOffset;
+
+ // size of the allocated memory, in bytes
+ private int capacity;
+
+ // default size for each row, grows as needed
+ private static final int DEFAULT_ROW_SIZE = 8;
+
+ UnsafeVarLengthColumnPage(DataType dataType, int pageSize) throws
MemoryException {
+ super(dataType, pageSize);
+ capacity = pageSize * DEFAULT_ROW_SIZE;
+ memoryBlock = UnsafeMemoryManager.allocateMemoryWithRetry(capacity);
+ baseAddress = memoryBlock.getBaseObject();
+ baseOffset = memoryBlock.getBaseOffset();
+ rowOffset = new int[pageSize];
+ totolLength = 0;
+ }
+
+ @Override
+ public void freeMemory() {
+ if (memoryBlock != null) {
+ UnsafeMemoryManager.INSTANCE.freeMemory(memoryBlock);
+ }
+ }
+
+ private void ensureMemory(int requestSize) throws MemoryException {
+ if (totolLength + requestSize > capacity) {
+ memoryBlock =
UnsafeMemoryManager.reallocateMemoryWithRetry(memoryBlock, requestSize);
+ }
+ }
+
+ @Override
+ public void putBytes(int rowId, byte[] bytes) {
+ int offset;
+ if (rowId == 0) {
+ offset = 0;
+ } else {
+ offset = rowOffset[rowId - 1];
+ }
+
+ try {
+ ensureMemory(bytes.length);
+ } catch (MemoryException e) {
+ throw new RuntimeException(e);
+ }
+
+ for (int i = 0; i < bytes.length; i++) {
+ CarbonUnsafe.unsafe.putByte(baseAddress, baseOffset + offset + i,
bytes[i]);
+ }
+ rowOffset[rowId] = offset + bytes.length + 4;
+ totolLength += bytes.length;
+ }
+
+ @Override
+ public void putBytes(int rowId, byte[] bytes, int offset, int length) {
+ int currentRowOffset = rowOffset[rowId];
+ for (int i = 0; i < length; i++) {
+ CarbonUnsafe.unsafe.putByte(baseAddress, baseOffset +
currentRowOffset + i, bytes[i]);
+ }
+ }
+
+ @Override
+ public BigDecimal getDecimal(int rowId) {
+ int offset, length;
+ if (rowId == 0) {
+ length = rowOffset[rowId];
+ offset = 0;
+ } else {
+ length = rowOffset[rowId] - rowOffset[rowId - 1];
+ offset = rowOffset[rowId - 1];
+ }
+
+ byte[] bytes = new byte[length];
+ for (int i = 0; i < length; i++) {
+ bytes[i] = CarbonUnsafe.unsafe.getByte(baseAddress, baseOffset +
offset + i);
+ }
+
+ return DataTypeUtil.byteToBigDecimal(bytes);
+ }
+
+ @Override
+ public byte[][] getByteArrayPage() {
+ byte[][] bytes = new byte[pageSize][];
+ for (int rowId = 0; rowId < pageSize; rowId++) {
+ int offset, length;
+ if (rowId == 0) {
+ length = rowOffset[rowId] - 4;
+ offset = 0;
+ } else {
+ length = rowOffset[rowId] - rowOffset[rowId - 1] - 4;
+ offset = rowOffset[rowId - 1];
+ }
+ byte[] rowData = new byte[length];
+ for (int j = 0; j < length; j++) {
+ rowData[j] = CarbonUnsafe.unsafe.getByte(baseAddress, baseOffset +
offset + j);
--- End diff --
even for copying also please `copyMemory`
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