Github user jackylk commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1000#discussion_r121940029
--- Diff:
core/src/main/java/org/apache/carbondata/core/datastore/page/VarLengthColumnPageBase.java
---
@@ -0,0 +1,212 @@
+/*
+ * 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.util.ArrayList;
+import java.util.List;
+
+import org.apache.carbondata.core.memory.MemoryException;
+import org.apache.carbondata.core.metadata.datatype.DataType;
+
+import static
org.apache.carbondata.core.metadata.datatype.DataType.DECIMAL;
+
+public abstract class VarLengthColumnPageBase extends ColumnPage {
+
+ // the offset of row whose id is (N + 1) in the unsafe memory
+ // for example, if first two rows are 8 bytes and 4 bytes, then
rowOffset[0] == 8,
+ // and rowOffset[1] == 12
+ int[] rowOffset;
+
+ // the length of bytes added in the page
+ int totolLength;
+
+ VarLengthColumnPageBase(DataType dataType, int pageSize) {
+ super(dataType, pageSize);
+ }
+
+ @Override
+ public void setBytePage(byte[] byteData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setShortPage(short[] shortData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setIntPage(int[] intData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setLongPage(long[] longData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setFloatPage(float[] floatData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setDoublePage(double[] doubleData) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ @Override
+ public void setByteArrayPage(byte[][] byteArray) {
+ throw new UnsupportedOperationException("invalid data type: " +
dataType);
+ }
+
+ /**
+ * Create a new column page based on the LV (Length Value) encoded bytes
+ */
+ static ColumnPage newDecimalColumnPage(byte[] lvEncodedBytes) throws
MemoryException {
+ // extract length and data, set them to rowOffset and unsafe memory
correspondingly
+ int rowId = 0;
+ List<Integer> rowOffset = new ArrayList<>();
+ List<Integer> rowLength = new ArrayList<>();
+ int length;
+ int offset = 0;
+ int nextRowOffset;
+
+ // extract Length field in input and calculate total length
+ for (offset = 0; offset < lvEncodedBytes.length; offset =
nextRowOffset) {
+ length = (((int)lvEncodedBytes[offset]) << 24) +
(((int)lvEncodedBytes[offset + 1]) << 16) +
--- End diff --
`ByteUtil.toInt` internal is using Unsafe, which it is wrong in this context
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