Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6738#discussion_r32243360
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -0,0 +1,206 @@
+/*
+ * 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.unsafe.types;
+
+import java.io.Serializable;
+import java.io.UnsupportedEncodingException;
+import java.util.Arrays;
+import javax.annotation.Nullable;
+
+import org.apache.spark.unsafe.PlatformDependent;
+
+/**
+ * A UTF-8 String for internal Spark use.
+ * <p>
+ * A String encoded in UTF-8 as an Array[Byte], which can be used for
comparison,
+ * search, see http://en.wikipedia.org/wiki/UTF-8 for details.
+ * <p>
+ * Note: This is not designed for general use cases, should not be used
outside SQL.
+ */
+public final class UTF8String implements Comparable<UTF8String>,
Serializable {
+
+ @Nullable
+ private byte[] bytes;
+
+ private static int[] bytesOfCodePointInUTF8 = {2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 4, 4, 4, 4, 4, 4, 4, 4,
+ 5, 5, 5, 5,
+ 6, 6, 6, 6};
+
+ public static UTF8String fromBytes(byte[] bytes) {
+ return (bytes != null) ? new UTF8String().set(bytes) : null;
+ }
+
+ public static UTF8String fromString(String str) {
+ return (str != null) ? new UTF8String().set(str) : null;
+ }
+
+ /**
+ * Updates the UTF8String with String.
+ */
+ public UTF8String set(final String str) {
+ bytes = str.getBytes();
--- End diff --
This is not portable, we should use UTF-8 here:
```
getBytes()
Encodes this String into a sequence of bytes using the platform's default
charset, storing the result into a new byte array.
```
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